Split build system into library and driver

226 files changed, 1990 insertions, 1507 deletions

diff --git a/README-GIT b/README-GIT
index 0bd7de9..efa6a36 100644
--- a/README-GIT
+++ b/README-GIT
@@ -9,3 +9,9 @@ git clone --recursive https://git.build2.org/build2.git
 Alternatively, if you have already cloned without --recursive, run:
 
 git submodule update --init
+
+The checked out libbuild2/version.hxx and libbuild2/config.hxx will be
+overwritten during the build process but these changes should be ignored. To
+do this automatically, run:
+
+git update-index --assume-unchanged libbuild2/version.hxx libbuild2/config.hxx
diff --git a/bootstrap-mingw.bat b/bootstrap-mingw.bat
index a43278e..e2b51b7 100644
--- a/bootstrap-mingw.bat
+++ b/bootstrap-mingw.bat
@@ -72,6 +72,7 @@ set "src=%src% build2\test\script"
 set "src=%src% build2\version"
 set "src=%src% build2\install"
 set "src=%src% build2\in"
+set "src=%src% libbuild2"
 set "src=%src% %libbutl%\libbutl"
 
 rem Get the compile options.
diff --git a/bootstrap-msvc.bat b/bootstrap-msvc.bat
index d9b4f5a..603395c 100644
--- a/bootstrap-msvc.bat
+++ b/bootstrap-msvc.bat
@@ -103,6 +103,7 @@ set "src=%src% build2\test\script"
 set "src=%src% build2\version"
 set "src=%src% build2\install"
 set "src=%src% build2\in"
+set "src=%src% libbuild2"
 set "src=%src% %libbutl%\libbutl"
 
 rem Get the compile options.
diff --git a/bootstrap.gmake b/bootstrap.gmake
index 2aac8fc..e2fea35 100644
--- a/bootstrap.gmake
+++ b/bootstrap.gmake
@@ -129,42 +129,48 @@ endif
 #
 # Note: list nested subdirectories first (used in clean).
 #
-sub_dirs := \
-config      \
-dist        \
-bin         \
-c           \
-cc          \
-cxx         \
-test/script \
-test        \
-version     \
-install     \
+build2_sub := \
+config        \
+dist          \
+bin           \
+c             \
+cc            \
+cxx           \
+test/script   \
+test          \
+version       \
+install       \
 in
 
-build2_src  := $(wildcard $(src_root)/build2/*.cxx)
-build2_src  += $(foreach d,$(sub_dirs),$(wildcard $(src_root)/build2/$d/*.cxx))
-libbutl_src := $(wildcard $(libbutl)/libbutl/*.cxx)
+build2_src    := $(wildcard $(src_root)/build2/*.cxx)
+build2_src    += $(foreach d,$(build2_sub),$(wildcard $(src_root)/build2/$d/*.cxx))
+libbuild2_src := $(wildcard $(src_root)/libbuild2/*.cxx)
+libbutl_src   := $(wildcard $(libbutl)/libbutl/*.cxx)
 
 # Filter out *.test.cxx sources.
 #
-build2_src  := $(filter-out %.test.cxx,$(build2_src))
-libbutl_src := $(filter-out %.test.cxx,$(libbutl_src))
+build2_src    := $(filter-out %.test.cxx,$(build2_src))
+libbuild2_src := $(filter-out %.test.cxx,$(libbuild2_src))
+libbutl_src   := $(filter-out %.test.cxx,$(libbutl_src))
 
 # Note that we use the .b.o object file extension to avoid clashing with the
 # build2 builds.
 #
-build2_obj  := $(patsubst $(src_root)/%.cxx,$(out_root)/%.b.o,$(build2_src))
-libbutl_obj := $(patsubst $(libbutl)/libbutl/%.cxx,$(libbutl_out)/%.b.o,$(libbutl_src))
+build2_obj    := $(patsubst $(src_root)/%.cxx,$(out_root)/%.b.o,$(build2_src))
+libbuild2_obj := $(patsubst $(src_root)/%.cxx,$(out_root)/%.b.o,$(libbuild2_src))
+libbutl_obj   := $(patsubst $(libbutl)/libbutl/%.cxx,$(libbutl_out)/%.b.o,$(libbutl_src))
 
 # Build.
 #
-$(out_root)/build2/b-boot$(exe): $(build2_obj) $(libbutl_obj)
+$(out_root)/build2/b-boot$(exe): $(build2_obj) $(libbuild2_obj) $(libbutl_obj)
 	$(CXX) -std=c++1y $(CXXFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 $(out_root)/build2/%.b.o: $(src_root)/build2/%.cxx | $$(dir $$@).
 	$(CXX) -I$(libbutl) -I$(src_root) -DBUILD2_BOOTSTRAP -DBUILD2_HOST_TRIPLET=\"$(chost)\" $(CPPFLAGS) -std=c++1y $(CXXFLAGS) -o $@ -c $<
 
+$(out_root)/libbuild2/%.b.o: $(src_root)/libbuild2/%.cxx | $$(dir $$@).
+	$(CXX) -I$(libbutl) -I$(src_root) -DBUILD2_BOOTSTRAP -DBUILD2_HOST_TRIPLET=\"$(chost)\" $(CPPFLAGS) -std=c++1y $(CXXFLAGS) -o $@ -c $<
+
 $(libbutl_out)/%.b.o: $(libbutl)/libbutl/%.cxx | $$(dir $$@).
 	$(CXX) -I$(libbutl) -DBUILD2_BOOTSTRAP $(CPPFLAGS) -std=c++1y $(CXXFLAGS) -o $@ -c $<
 
@@ -181,10 +187,11 @@ all: $(out_root)/build2/b-boot$(exe)
 
 cleano:
 	rm -f $(build2_obj)
+	rm -f $(libbuild2_obj)
 	rm -f $(libbutl_obj)
 
 clean: cleano
 	rm -f $(out_root)/build2/b-boot$(exe)
 ifeq ($(in_tree),false)
-	rm -fd $(foreach d,$(sub_dirs),$(out_root)/build2/$d) $(out_root)/build2 $(libbutl_out)
+	rm -fd $(foreach d,$(build2_sub),$(out_root)/build2/$d) $(out_root)/build2 $(out_root)/libbuild2 $(libbutl_out)
 endif
diff --git a/bootstrap.sh b/bootstrap.sh
index 6116550..4cacd74 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -130,6 +130,7 @@ src="$src build2/version/*.cxx"
 src="$src build2/install/*.cxx"
 src="$src build2/in/*.cxx"
 src="$src build2/bash/*.cxx"
+src="$src libbuild2/*.cxx"
 src="$src $libbutl/libbutl/*.cxx"
 
 # Filter out *.test.cxx sources.
diff --git a/build/export.build b/build/export.build
index dc94fa4..8bca42a 100644
--- a/build/export.build
+++ b/build/export.build
@@ -7,4 +7,7 @@ $out_root/
   include build2/
 }
 
-export $out_root/build2/exe{b}
+if ($import.target == exe{b})
+  export $out_root/build2/exe{b}
+elif ($import.target == lib{build2})
+  export $out_root/libbuild2/lib{build2}
diff --git a/build/root.build b/build/root.build
index 03e3fe6..9dbad8d 100644
--- a/build/root.build
+++ b/build/root.build
@@ -24,7 +24,7 @@ cxx.poptions =+ "-I$out_root" "-I$src_root"
 # While we don't have any C sources to compile, we need to get the C compiler
 # path to use as native/default.
 #
-using c
+using c.config
 
 # Load the cli module but only if it's available. This way a distribution
 # that includes pre-generated files can be built without installing cli.
diff --git a/build2/.gitignore b/build2/.gitignore
index 51b4c16..83bbed4 100644
--- a/build2/.gitignore
+++ b/build2/.gitignore
@@ -1,11 +1,11 @@
 b
 b-boot
-*.test
+
 #*-options
 #*-options.?xx
-config.hxx
-version.hxx
 
-# Testscript output directory (can be symlink).
+# Unit test executables and Testscript output directories
+# (can be symlinks).
 #
+*.test
 test-*.test
diff --git a/build2/b-options.hxx b/build2/b-options.hxx
index 45666aa..c745025 100644
--- a/build2/b-options.hxx
+++ b/build2/b-options.hxx
@@ -365,7 +365,7 @@ namespace build2
 
 #include <set>
 
-#include <build2/types.hxx>
+#include <libbuild2/types.hxx>
 
 namespace build2
 {
diff --git a/build2/b.cli b/build2/b.cli
index 802a160..4ab397b 100644
--- a/build2/b.cli
+++ b/build2/b.cli
@@ -3,7 +3,7 @@
 // license   : MIT; see accompanying LICENSE file
 
 include <set>;
-include <build2/types.hxx>;
+include <libbuild2/types.hxx>;
 
 "\section=1"
 "\name=b"
diff --git a/build2/b.cxx b/build2/b.cxx
index 0eb007c..32d42aa 100644
--- a/build2/b.cxx
+++ b/build2/b.cxx
@@ -22,28 +22,31 @@
 #include <libbutl/fdstream.mxx>  // stderr_fd(), fdterm()
 #include <libbutl/backtrace.mxx> // backtrace()
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
-
-#include <build2/dump.hxx>
-#include <build2/file.hxx>
-#include <build2/rule.hxx>
-#include <build2/spec.hxx>
-#include <build2/scope.hxx>
-#include <build2/module.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/operation.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
-#include <build2/prerequisite.hxx>
-
-#include <build2/parser.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/dump.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/spec.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/operation.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
+#include <libbuild2/prerequisite.hxx>
+
+#include <libbuild2/parser.hxx>
 
 #include <build2/b-options.hxx>
 
+#include <build2/config/utility.hxx>   // config::save_variable()
+#include <build2/config/operation.hxx> // config::preprocess_create()
+
 using namespace butl;
 using namespace std;
 
@@ -365,7 +368,7 @@ main (int argc, char* argv[])
     //
     if (ops.version ())
     {
-      cout << "build2 " << BUILD2_VERSION_ID << endl
+      cout << "build2 " << LIBBUILD2_VERSION_ID << endl
            << "libbutl " << LIBBUTL_VERSION_ID << endl
            << "host " << BUILD2_HOST_TRIPLET << endl
            << "Copyright (c) 2014-2019 Code Synthesis Ltd" << endl
@@ -437,6 +440,10 @@ main (int argc, char* argv[])
       auto& bm (builtin_modules);
 
       bm["config"]  = mf {&config::boot, &config::init};
+
+      config_save_variable = &config::save_variable;
+      config_preprocess_create = &config::preprocess_create;
+
       bm["dist"]    = mf {&dist::boot, &dist::init};
       bm["test"]    = mf {&test::boot, &test::init};
       bm["install"] = mf {&install::boot, &install::init};
diff --git a/build2/bash/init.cxx b/build2/bash/init.cxx
index 6812f2b..83bfdb9 100644
--- a/build2/bash/init.cxx
+++ b/build2/bash/init.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/bash/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/install/utility.hxx>
 
diff --git a/build2/bash/init.hxx b/build2/bash/init.hxx
index f4a82d7..2a7e95c 100644
--- a/build2/bash/init.hxx
+++ b/build2/bash/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_BASH_INIT_HXX
 #define BUILD2_BASH_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/bash/rule.cxx b/build2/bash/rule.cxx
index 09cc930..72e3219 100644
--- a/build2/bash/rule.cxx
+++ b/build2/bash/rule.cxx
@@ -6,10 +6,10 @@
 
 #include <cstring> // strlen(), strchr()
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/in/target.hxx>
 
diff --git a/build2/bash/rule.hxx b/build2/bash/rule.hxx
index 9a1b161..6430947 100644
--- a/build2/bash/rule.hxx
+++ b/build2/bash/rule.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_BASH_RULE_HXX
 #define BUILD2_BASH_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/in/rule.hxx>
 #include <build2/install/rule.hxx>
diff --git a/build2/bash/target.cxx b/build2/bash/target.cxx
index 8a4bd9e..e843d53 100644
--- a/build2/bash/target.cxx
+++ b/build2/bash/target.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/bash/target.hxx>
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 
diff --git a/build2/bash/target.hxx b/build2/bash/target.hxx
index d1ab5b1..6be83c4 100644
--- a/build2/bash/target.hxx
+++ b/build2/bash/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_BASH_TARGET_HXX
 #define BUILD2_BASH_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/bash/utility.hxx b/build2/bash/utility.hxx
index e7f72f4..31a6b99 100644
--- a/build2/bash/utility.hxx
+++ b/build2/bash/utility.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_BASH_UTILITY_HXX
 #define BUILD2_BASH_UTILITY_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 namespace build2
 {
diff --git a/build2/bin/guess.cxx b/build2/bin/guess.cxx
index c5effd7..d1b1545 100644
--- a/build2/bin/guess.cxx
+++ b/build2/bin/guess.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/bin/guess.hxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/bin/guess.hxx b/build2/bin/guess.hxx
index a9c7246..a3b2b34 100644
--- a/build2/bin/guess.hxx
+++ b/build2/bin/guess.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_BIN_GUESS_HXX
 #define BUILD2_BIN_GUESS_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 namespace build2
 {
diff --git a/build2/bin/init.cxx b/build2/bin/init.cxx
index cf47fbe..37fad6b 100644
--- a/build2/bin/init.cxx
+++ b/build2/bin/init.cxx
@@ -6,9 +6,9 @@
 
 #include <map>
 
-#include <build2/scope.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/bin/init.hxx b/build2/bin/init.hxx
index c58dbfd..989dcaf 100644
--- a/build2/bin/init.hxx
+++ b/build2/bin/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_BIN_INIT_HXX
 #define BUILD2_BIN_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/bin/rule.cxx b/build2/bin/rule.cxx
index 7eaa308..42ba86a 100644
--- a/build2/bin/rule.cxx
+++ b/build2/bin/rule.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/bin/rule.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/bin/rule.hxx b/build2/bin/rule.hxx
index 19902c9..4230933 100644
--- a/build2/bin/rule.hxx
+++ b/build2/bin/rule.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_BIN_RULE_HXX
 #define BUILD2_BIN_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
+#include <libbuild2/rule.hxx>
 
 namespace build2
 {
diff --git a/build2/bin/target.cxx b/build2/bin/target.cxx
index c602f3b..46f19bd 100644
--- a/build2/bin/target.cxx
+++ b/build2/bin/target.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/bin/target.hxx>
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 
diff --git a/build2/bin/target.hxx b/build2/bin/target.hxx
index 1430477..a56c636 100644
--- a/build2/bin/target.hxx
+++ b/build2/bin/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_BIN_TARGET_HXX
 #define BUILD2_BIN_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/buildfile b/build2/buildfile
index ba8f25c..eb22266 100644
--- a/build2/buildfile
+++ b/build2/buildfile
@@ -5,14 +5,13 @@
 import libs  = libbutl%lib{butl}
 import libs += libpkgconf%lib{pkgconf}
 
-./: exe{b}: {hxx ixx txx cxx}{+b} libue{b}
+include ../libbuild2/
 
-libue{b}: {hxx ixx txx cxx}{** -b -b-options -config -version -**.test...} \
-          {hxx ixx cxx}{b-options} {hxx}{config version}                   \
-          $libs
+./: exe{b}: {hxx ixx txx cxx}{+b} libue{b}
 
-hxx{config}: in{config}
-hxx{version}: in{version} $src_root/manifest
+libue{b}: {hxx ixx txx cxx}{** -b -b-options -**.test...} \
+          {hxx ixx cxx}{b-options}                        \
+          ../libbuild2/lib{build2} $libs
 
 # Unit tests.
 #
@@ -36,7 +35,7 @@ for t: cxx{**.test...}
 #
 # Pass our compiler target to be used as build2 host.
 #
-obj{b context}: cxx.poptions += -DBUILD2_HOST_TRIPLET=\"$cxx.target\"
+obj{b}: cxx.poptions += -DBUILD2_HOST_TRIPLET=\"$cxx.target\"
 
 # Pass native C and C++ compiler paths (not forgetting to escape backslashes
 # on Windows). These are used as defaults for BUILD2_DEFAULT_*.
diff --git a/build2/c/init.cxx b/build2/c/init.cxx
index 7c12fdd..08846a7 100644
--- a/build2/c/init.cxx
+++ b/build2/c/init.cxx
@@ -4,9 +4,9 @@
 
 #include <build2/c/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cc/guess.hxx>
 #include <build2/cc/module.hxx>
diff --git a/build2/c/init.hxx b/build2/c/init.hxx
index 54cebf1..77119a9 100644
--- a/build2/c/init.hxx
+++ b/build2/c/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_C_INIT_HXX
 #define BUILD2_C_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/c/target.hxx b/build2/c/target.hxx
index 3119758..486c29c 100644
--- a/build2/c/target.hxx
+++ b/build2/c/target.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_C_TARGET_HXX
 #define BUILD2_C_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/cc/target.hxx>
 
diff --git a/build2/cc/common.cxx b/build2/cc/common.cxx
index fa774d7..84ebbd5 100644
--- a/build2/cc/common.cxx
+++ b/build2/cc/common.cxx
@@ -4,13 +4,13 @@
 
 #include <build2/cc/common.hxx>
 
-#include <build2/file.hxx>        // import()
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>        // import()
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cc/utility.hxx>
 
diff --git a/build2/cc/common.hxx b/build2/cc/common.hxx
index 6eccf23..c58a7f3 100644
--- a/build2/cc/common.hxx
+++ b/build2/cc/common.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_COMMON_HXX
 #define BUILD2_CC_COMMON_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/variable.hxx>
+#include <libbuild2/variable.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/compile-rule.cxx b/build2/cc/compile-rule.cxx
index a1796eb..c0c7eb3 100644
--- a/build2/cc/compile-rule.cxx
+++ b/build2/cc/compile-rule.cxx
@@ -7,14 +7,14 @@
 #include <cstdlib>  // exit()
 #include <cstring>  // strlen(), strchr()
 
-#include <build2/file.hxx>
-#include <build2/depdb.hxx>
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>  // mtime()
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/depdb.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>  // mtime()
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 #include <build2/config/utility.hxx> // create_project()
diff --git a/build2/cc/compile-rule.hxx b/build2/cc/compile-rule.hxx
index ab19e1c..62127a7 100644
--- a/build2/cc/compile-rule.hxx
+++ b/build2/cc/compile-rule.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_CC_COMPILE_RULE_HXX
 #define BUILD2_CC_COMPILE_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
-#include <build2/filesystem.hxx> // auto_rmfile
+#include <libbuild2/rule.hxx>
+#include <libbuild2/filesystem.hxx> // auto_rmfile
 
 #include <build2/cc/types.hxx>
 #include <build2/cc/common.hxx>
diff --git a/build2/cc/gcc.cxx b/build2/cc/gcc.cxx
index 724c555..52cc386 100644
--- a/build2/cc/gcc.cxx
+++ b/build2/cc/gcc.cxx
@@ -2,12 +2,12 @@
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/guess.cxx b/build2/cc/guess.cxx
index f5db253..c74ccaf 100644
--- a/build2/cc/guess.cxx
+++ b/build2/cc/guess.cxx
@@ -7,7 +7,7 @@
 #include <map>
 #include <cstring>  // strlen(), strchr()
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/cc/guess.hxx b/build2/cc/guess.hxx
index b807446..1ab6e49 100644
--- a/build2/cc/guess.hxx
+++ b/build2/cc/guess.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_CC_GUESS_HXX
 #define BUILD2_CC_GUESS_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/cc/types.hxx>
 
diff --git a/build2/cc/init.cxx b/build2/cc/init.cxx
index 882b205..18fba20 100644
--- a/build2/cc/init.cxx
+++ b/build2/cc/init.cxx
@@ -4,11 +4,11 @@
 
 #include <build2/cc/init.hxx>
 
-#include <build2/file.hxx>
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/cc/init.hxx b/build2/cc/init.hxx
index e62da3e..98defde 100644
--- a/build2/cc/init.hxx
+++ b/build2/cc/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_INIT_HXX
 #define BUILD2_CC_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/cc/install-rule.cxx b/build2/cc/install-rule.cxx
index 5f8722b..ce2424c 100644
--- a/build2/cc/install-rule.cxx
+++ b/build2/cc/install-rule.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/cc/install-rule.hxx>
 
-#include <build2/algorithm.hxx>
+#include <libbuild2/algorithm.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/install-rule.hxx b/build2/cc/install-rule.hxx
index 7616b61..ea966b8 100644
--- a/build2/cc/install-rule.hxx
+++ b/build2/cc/install-rule.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_CC_INSTALL_RULE_HXX
 #define BUILD2_CC_INSTALL_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/install/rule.hxx>
 
diff --git a/build2/cc/lexer.hxx b/build2/cc/lexer.hxx
index c8b1042..5d5fa60 100644
--- a/build2/cc/lexer.hxx
+++ b/build2/cc/lexer.hxx
@@ -8,10 +8,10 @@
 #include <libbutl/sha256.mxx>
 #include <libbutl/char-scanner.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 namespace build2
 {
diff --git a/build2/cc/lexer.test.cxx b/build2/cc/lexer.test.cxx
index a2e33b7..4acc304 100644
--- a/build2/cc/lexer.test.cxx
+++ b/build2/cc/lexer.test.cxx
@@ -5,8 +5,8 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/cc/lexer.hxx>
 
diff --git a/build2/cc/link-rule.cxx b/build2/cc/link-rule.cxx
index 9942f48..6dfcfa9 100644
--- a/build2/cc/link-rule.cxx
+++ b/build2/cc/link-rule.cxx
@@ -10,13 +10,13 @@
 
 #include <libbutl/filesystem.mxx> // file_exists()
 
-#include <build2/depdb.hxx>
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/depdb.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/link-rule.hxx b/build2/cc/link-rule.hxx
index 14a8570..487b1cd 100644
--- a/build2/cc/link-rule.hxx
+++ b/build2/cc/link-rule.hxx
@@ -7,10 +7,10 @@
 
 #include <set>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
+#include <libbuild2/rule.hxx>
 
 #include <build2/cc/types.hxx>
 #include <build2/cc/common.hxx>
diff --git a/build2/cc/module.cxx b/build2/cc/module.cxx
index 7ea790b..ec35444 100644
--- a/build2/cc/module.cxx
+++ b/build2/cc/module.cxx
@@ -6,9 +6,9 @@
 
 #include <iomanip> // left, setw()
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/module.hxx b/build2/cc/module.hxx
index f277f95..a7f787f 100644
--- a/build2/cc/module.hxx
+++ b/build2/cc/module.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_CC_MODULE_HXX
 #define BUILD2_CC_MODULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/variable.hxx>
 
 #include <build2/cc/common.hxx>
 
diff --git a/build2/cc/msvc.cxx b/build2/cc/msvc.cxx
index 08cd43c..e978f6a 100644
--- a/build2/cc/msvc.cxx
+++ b/build2/cc/msvc.cxx
@@ -4,13 +4,13 @@
 
 #include <cstring> // strcmp()
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cc/parser.hxx b/build2/cc/parser.hxx
index 2050dd1..3a588e9 100644
--- a/build2/cc/parser.hxx
+++ b/build2/cc/parser.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_PARSER_HXX
 #define BUILD2_CC_PARSER_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cc/types.hxx>
 
diff --git a/build2/cc/parser.test.cxx b/build2/cc/parser.test.cxx
index 2269a28..3b2da57 100644
--- a/build2/cc/parser.test.cxx
+++ b/build2/cc/parser.test.cxx
@@ -5,8 +5,8 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/cc/parser.hxx>
 
diff --git a/build2/cc/pkgconfig.cxx b/build2/cc/pkgconfig.cxx
index dcf3cff..99715be 100644
--- a/build2/cc/pkgconfig.cxx
+++ b/build2/cc/pkgconfig.cxx
@@ -9,13 +9,13 @@
 #  include <libpkgconf/libpkgconf.h>
 #endif
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/install/utility.hxx>
 
diff --git a/build2/cc/target.cxx b/build2/cc/target.cxx
index d31a38c..c637e60 100644
--- a/build2/cc/target.cxx
+++ b/build2/cc/target.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/cc/target.hxx>
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 
diff --git a/build2/cc/target.hxx b/build2/cc/target.hxx
index 6764fe5..fd6f6d5 100644
--- a/build2/cc/target.hxx
+++ b/build2/cc/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_TARGET_HXX
 #define BUILD2_CC_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/cc/types.hxx b/build2/cc/types.hxx
index 60c9a34..481c3c6 100644
--- a/build2/cc/types.hxx
+++ b/build2/cc/types.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_TYPES_HXX
 #define BUILD2_CC_TYPES_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target-type.hxx>
+#include <libbuild2/target-type.hxx>
 
 namespace build2
 {
diff --git a/build2/cc/utility.cxx b/build2/cc/utility.cxx
index 2751032..2179c14 100644
--- a/build2/cc/utility.cxx
+++ b/build2/cc/utility.cxx
@@ -4,9 +4,9 @@
 
 #include <build2/cc/utility.hxx>
 
-#include <build2/file.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx> // search()
+#include <libbuild2/file.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx> // search()
 
 #include <build2/bin/rule.hxx>
 #include <build2/bin/target.hxx>
diff --git a/build2/cc/utility.hxx b/build2/cc/utility.hxx
index bc6c3fb..80ca741 100644
--- a/build2/cc/utility.hxx
+++ b/build2/cc/utility.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CC_UTILITY_HXX
 #define BUILD2_CC_UTILITY_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 #include <build2/bin/target.hxx>
 
 #include <build2/cc/types.hxx>
diff --git a/build2/cc/windows-manifest.cxx b/build2/cc/windows-manifest.cxx
index f890ad5..da12f0f 100644
--- a/build2/cc/windows-manifest.cxx
+++ b/build2/cc/windows-manifest.cxx
@@ -2,12 +2,12 @@
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cc/link-rule.hxx>
 
diff --git a/build2/cc/windows-rpath.cxx b/build2/cc/windows-rpath.cxx
index 9ad2602..d18e36d 100644
--- a/build2/cc/windows-rpath.cxx
+++ b/build2/cc/windows-rpath.cxx
@@ -4,12 +4,12 @@
 
 #include <errno.h> // E*
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/bin/target.hxx>
 
diff --git a/build2/cli/init.cxx b/build2/cli/init.cxx
index 35ef04e..24266ca 100644
--- a/build2/cli/init.cxx
+++ b/build2/cli/init.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/cli/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cxx/target.hxx>
 
diff --git a/build2/cli/init.hxx b/build2/cli/init.hxx
index e6a7079..341dc11 100644
--- a/build2/cli/init.hxx
+++ b/build2/cli/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CLI_INIT_HXX
 #define BUILD2_CLI_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/cli/rule.cxx b/build2/cli/rule.cxx
index 2da5802..f6bebee 100644
--- a/build2/cli/rule.cxx
+++ b/build2/cli/rule.cxx
@@ -4,13 +4,13 @@
 
 #include <build2/cli/rule.hxx>
 
-#include <build2/depdb.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/depdb.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cli/target.hxx>
 
diff --git a/build2/cli/rule.hxx b/build2/cli/rule.hxx
index 3603f47..e839999 100644
--- a/build2/cli/rule.hxx
+++ b/build2/cli/rule.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CLI_RULE_HXX
 #define BUILD2_CLI_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
+#include <libbuild2/rule.hxx>
 
 namespace build2
 {
diff --git a/build2/cli/target.cxx b/build2/cli/target.cxx
index 33aff72..096295a 100644
--- a/build2/cli/target.cxx
+++ b/build2/cli/target.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/cli/target.hxx>
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/cli/target.hxx b/build2/cli/target.hxx
index 44126ff..c6aa266 100644
--- a/build2/cli/target.hxx
+++ b/build2/cli/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CLI_TARGET_HXX
 #define BUILD2_CLI_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 #include <build2/cxx/target.hxx>
 
diff --git a/build2/config/init.cxx b/build2/config/init.cxx
index 7b518ab..bd2d573 100644
--- a/build2/config/init.cxx
+++ b/build2/config/init.cxx
@@ -4,12 +4,12 @@
 
 #include <build2/config/init.hxx>
 
-#include <build2/file.hxx>
-#include <build2/rule.hxx>
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>  // exists()
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>  // exists()
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/module.hxx>
 #include <build2/config/utility.hxx>
diff --git a/build2/config/init.hxx b/build2/config/init.hxx
index 2ac0f96..5a9b66d 100644
--- a/build2/config/init.hxx
+++ b/build2/config/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CONFIG_INIT_HXX
 #define BUILD2_CONFIG_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/config/module.hxx b/build2/config/module.hxx
index 10dac40..0c78b18 100644
--- a/build2/config/module.hxx
+++ b/build2/config/module.hxx
@@ -9,11 +9,11 @@
 
 #include <libbutl/prefix-map.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/variable.hxx>
 
 namespace build2
 {
diff --git a/build2/config/operation.cxx b/build2/config/operation.cxx
index f857330..ff5b44a 100644
--- a/build2/config/operation.cxx
+++ b/build2/config/operation.cxx
@@ -6,14 +6,14 @@
 
 #include <set>
 
-#include <build2/file.hxx>
-#include <build2/spec.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/spec.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/module.hxx>
 #include <build2/config/utility.hxx>
diff --git a/build2/config/operation.hxx b/build2/config/operation.hxx
index 2892885..9f426ca 100644
--- a/build2/config/operation.hxx
+++ b/build2/config/operation.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CONFIG_OPERATION_HXX
 #define BUILD2_CONFIG_OPERATION_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/operation.hxx>
+#include <libbuild2/operation.hxx>
 
 namespace build2
 {
diff --git a/build2/config/utility.cxx b/build2/config/utility.cxx
index e15c689..1ce07f7 100644
--- a/build2/config/utility.cxx
+++ b/build2/config/utility.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/config/utility.hxx>
 
-#include <build2/file.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/module.hxx>
 
diff --git a/build2/config/utility.hxx b/build2/config/utility.hxx
index eff1a02..5e4eac2 100644
--- a/build2/config/utility.hxx
+++ b/build2/config/utility.hxx
@@ -5,12 +5,12 @@
 #ifndef BUILD2_CONFIG_UTILITY_HXX
 #define BUILD2_CONFIG_UTILITY_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 namespace build2
 {
diff --git a/build2/config/utility.txx b/build2/config/utility.txx
index b8e0acc..84650d9 100644
--- a/build2/config/utility.txx
+++ b/build2/config/utility.txx
@@ -2,8 +2,8 @@
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
 
 namespace build2
 {
diff --git a/build2/cxx/init.cxx b/build2/cxx/init.cxx
index 518a823..9db5817 100644
--- a/build2/cxx/init.cxx
+++ b/build2/cxx/init.cxx
@@ -4,9 +4,9 @@
 
 #include <build2/cxx/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/cc/guess.hxx>
 #include <build2/cc/module.hxx>
diff --git a/build2/cxx/init.hxx b/build2/cxx/init.hxx
index 0a8bde9..83553e6 100644
--- a/build2/cxx/init.hxx
+++ b/build2/cxx/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CXX_INIT_HXX
 #define BUILD2_CXX_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/cxx/target.cxx b/build2/cxx/target.cxx
index 1b7c1cf..025bf9d 100644
--- a/build2/cxx/target.cxx
+++ b/build2/cxx/target.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/cxx/target.hxx>
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 
diff --git a/build2/cxx/target.hxx b/build2/cxx/target.hxx
index 33959af..fabd3b6 100644
--- a/build2/cxx/target.hxx
+++ b/build2/cxx/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_CXX_TARGET_HXX
 #define BUILD2_CXX_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 #include <build2/cc/target.hxx>
 
 namespace build2
diff --git a/build2/dist/init.cxx b/build2/dist/init.cxx
index 56f676a..8edbccb 100644
--- a/build2/dist/init.cxx
+++ b/build2/dist/init.cxx
@@ -4,9 +4,9 @@
 
 #include <build2/dist/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/file.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/dist/init.hxx b/build2/dist/init.hxx
index f337dad..0449a99 100644
--- a/build2/dist/init.hxx
+++ b/build2/dist/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_DIST_INIT_HXX
 #define BUILD2_DIST_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/dist/module.hxx b/build2/dist/module.hxx
index 74d8854..cd0d9a3 100644
--- a/build2/dist/module.hxx
+++ b/build2/dist/module.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_DIST_MODULE_HXX
 #define BUILD2_DIST_MODULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/variable.hxx>
 
 namespace build2
 {
diff --git a/build2/dist/operation.cxx b/build2/dist/operation.cxx
index 3b247b2..ca90b50 100644
--- a/build2/dist/operation.cxx
+++ b/build2/dist/operation.cxx
@@ -9,14 +9,14 @@
 
 #include <libbutl/filesystem.mxx> // path_match()
 
-#include <build2/file.hxx>
-#include <build2/dump.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/dump.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/dist/module.hxx>
 
diff --git a/build2/dist/operation.hxx b/build2/dist/operation.hxx
index 592bf8c..00d8664 100644
--- a/build2/dist/operation.hxx
+++ b/build2/dist/operation.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_DIST_OPERATION_HXX
 #define BUILD2_DIST_OPERATION_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/operation.hxx>
+#include <libbuild2/operation.hxx>
 
 namespace build2
 {
diff --git a/build2/dist/rule.cxx b/build2/dist/rule.cxx
index 274e3c2..c877abc 100644
--- a/build2/dist/rule.cxx
+++ b/build2/dist/rule.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/dist/rule.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/dist/rule.hxx b/build2/dist/rule.hxx
index b409118..accce4c 100644
--- a/build2/dist/rule.hxx
+++ b/build2/dist/rule.hxx
@@ -5,12 +5,12 @@
 #ifndef BUILD2_DIST_RULE_HXX
 #define BUILD2_DIST_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
-#include <build2/action.hxx>
-#include <build2/target.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/in/init.cxx b/build2/in/init.cxx
index 1bd93e1..f01fe20 100644
--- a/build2/in/init.cxx
+++ b/build2/in/init.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/in/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/in/rule.hxx>
 #include <build2/in/target.hxx>
diff --git a/build2/in/init.hxx b/build2/in/init.hxx
index a8482f8..3cf8ebf 100644
--- a/build2/in/init.hxx
+++ b/build2/in/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_IN_INIT_HXX
 #define BUILD2_IN_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/in/rule.cxx b/build2/in/rule.cxx
index a6d4f2c..8a3244d 100644
--- a/build2/in/rule.cxx
+++ b/build2/in/rule.cxx
@@ -6,13 +6,13 @@
 
 #include <cstdlib> // strtoull()
 
-#include <build2/depdb.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/function.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/depdb.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/in/target.hxx>
 
diff --git a/build2/in/rule.hxx b/build2/in/rule.hxx
index b3430c5..71dc032 100644
--- a/build2/in/rule.hxx
+++ b/build2/in/rule.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_IN_RULE_HXX
 #define BUILD2_IN_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
+#include <libbuild2/rule.hxx>
 
 namespace build2
 {
diff --git a/build2/in/target.hxx b/build2/in/target.hxx
index 2e735f8..47b0eed 100644
--- a/build2/in/target.hxx
+++ b/build2/in/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_IN_TARGET_HXX
 #define BUILD2_IN_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/install/functions.cxx b/build2/install/functions.cxx
index a097052..5780fd8 100644
--- a/build2/install/functions.cxx
+++ b/build2/install/functions.cxx
@@ -2,8 +2,8 @@
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 #include <build2/install/utility.hxx>
 
diff --git a/build2/install/init.cxx b/build2/install/init.cxx
index 06bef86..055b8b1 100644
--- a/build2/install/init.cxx
+++ b/build2/install/init.cxx
@@ -4,12 +4,12 @@
 
 #include <build2/install/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/rule.hxx>
-#include <build2/function.hxx>
-#include <build2/operation.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/operation.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/install/init.hxx b/build2/install/init.hxx
index 968ae93..579c03e 100644
--- a/build2/install/init.hxx
+++ b/build2/install/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_INSTALL_INIT_HXX
 #define BUILD2_INSTALL_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/install/operation.hxx b/build2/install/operation.hxx
index 1cfbab5..7de0225 100644
--- a/build2/install/operation.hxx
+++ b/build2/install/operation.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_INSTALL_OPERATION_HXX
 #define BUILD2_INSTALL_OPERATION_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/operation.hxx>
+#include <libbuild2/operation.hxx>
 
 namespace build2
 {
diff --git a/build2/install/rule.cxx b/build2/install/rule.cxx
index a17cc0d..faa7c3f 100644
--- a/build2/install/rule.cxx
+++ b/build2/install/rule.cxx
@@ -6,11 +6,11 @@
 
 #include <libbutl/filesystem.mxx> // dir_exists(), file_exists()
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/install/rule.hxx b/build2/install/rule.hxx
index 526683d..09dd1b5 100644
--- a/build2/install/rule.hxx
+++ b/build2/install/rule.hxx
@@ -5,13 +5,13 @@
 #ifndef BUILD2_INSTALL_RULE_HXX
 #define BUILD2_INSTALL_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
-#include <build2/action.hxx>
-#include <build2/target.hxx>
-#include <build2/filesystem.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/filesystem.hxx>
 
 namespace build2
 {
diff --git a/build2/install/utility.hxx b/build2/install/utility.hxx
index 2544630..29c6db0 100644
--- a/build2/install/utility.hxx
+++ b/build2/install/utility.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_INSTALL_UTILITY_HXX
 #define BUILD2_INSTALL_UTILITY_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/test/common.cxx b/build2/test/common.cxx
index 161ba94..bbfd489 100644
--- a/build2/test/common.cxx
+++ b/build2/test/common.cxx
@@ -4,8 +4,8 @@
 
 #include <build2/test/common.hxx>
 
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
 
 using namespace std;
 
diff --git a/build2/test/common.hxx b/build2/test/common.hxx
index f5d31c3..7ee72bd 100644
--- a/build2/test/common.hxx
+++ b/build2/test/common.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_COMMON_HXX
 #define BUILD2_TEST_COMMON_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/test/init.cxx b/build2/test/init.cxx
index 342add7..725d557 100644
--- a/build2/test/init.cxx
+++ b/build2/test/init.cxx
@@ -4,10 +4,10 @@
 
 #include <build2/test/init.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/rule.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/test/init.hxx b/build2/test/init.hxx
index 2ef0af7..f429645 100644
--- a/build2/test/init.hxx
+++ b/build2/test/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_INIT_HXX
 #define BUILD2_TEST_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/test/module.hxx b/build2/test/module.hxx
index 02ba492..0c32fb9 100644
--- a/build2/test/module.hxx
+++ b/build2/test/module.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_MODULE_HXX
 #define BUILD2_TEST_MODULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 #include <build2/test/rule.hxx>
 #include <build2/test/common.hxx>
diff --git a/build2/test/operation.hxx b/build2/test/operation.hxx
index 9b5f8db..09b954e 100644
--- a/build2/test/operation.hxx
+++ b/build2/test/operation.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_OPERATION_HXX
 #define BUILD2_TEST_OPERATION_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/operation.hxx>
+#include <libbuild2/operation.hxx>
 
 namespace build2
 {
diff --git a/build2/test/rule.cxx b/build2/test/rule.cxx
index a67ceff..7cb830c 100644
--- a/build2/test/rule.cxx
+++ b/build2/test/rule.cxx
@@ -4,11 +4,11 @@
 
 #include <build2/test/rule.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/test/target.hxx>
 
@@ -548,7 +548,7 @@ namespace build2
                                 diag_frame::stack_guard dsg (ds);
                                 r = perform_script_impl (t, ts, wd, *this);
                               },
-                              diag_frame::stack,
+                              diag_frame::stack (),
                               ref (r),
                               cref (t),
                               cref (ts),
diff --git a/build2/test/rule.hxx b/build2/test/rule.hxx
index 81952f9..2f0ef53 100644
--- a/build2/test/rule.hxx
+++ b/build2/test/rule.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_TEST_RULE_HXX
 #define BUILD2_TEST_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/rule.hxx>
-#include <build2/action.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/action.hxx>
 
 #include <build2/test/common.hxx>
 
diff --git a/build2/test/script/builtin.cxx b/build2/test/script/builtin.cxx
index e4eb895..14ea267 100644
--- a/build2/test/script/builtin.cxx
+++ b/build2/test/script/builtin.cxx
@@ -15,7 +15,7 @@
 #include <libbutl/fdstream.mxx>   // fdopen_mode, fdstream_mode
 #include <libbutl/filesystem.mxx>
 
-#include <build2/context.hxx> // sched
+#include <libbuild2/context.hxx> // sched
 
 #include <build2/test/script/script.hxx>
 
diff --git a/build2/test/script/builtin.hxx b/build2/test/script/builtin.hxx
index 2c6c0c5..af7c809 100644
--- a/build2/test/script/builtin.hxx
+++ b/build2/test/script/builtin.hxx
@@ -7,8 +7,8 @@
 
 #include <map>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 namespace build2
 {
diff --git a/build2/test/script/lexer.hxx b/build2/test/script/lexer.hxx
index 5ab0cc0..ad1c386 100644
--- a/build2/test/script/lexer.hxx
+++ b/build2/test/script/lexer.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_SCRIPT_LEXER_HXX
 #define BUILD2_TEST_SCRIPT_LEXER_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/lexer.hxx>
+#include <libbuild2/lexer.hxx>
 
 #include <build2/test/script/token.hxx>
 
diff --git a/build2/test/script/lexer.test.cxx b/build2/test/script/lexer.test.cxx
index 56418b7..c9905ec 100644
--- a/build2/test/script/lexer.test.cxx
+++ b/build2/test/script/lexer.test.cxx
@@ -5,8 +5,8 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/test/script/token.hxx>
 #include <build2/test/script/lexer.hxx>
diff --git a/build2/test/script/parser.cxx b/build2/test/script/parser.cxx
index 2ae0b05..59b950f 100644
--- a/build2/test/script/parser.cxx
+++ b/build2/test/script/parser.cxx
@@ -6,7 +6,7 @@
 
 #include <sstream>
 
-#include <build2/context.hxx> // sched, keep_going
+#include <libbuild2/context.hxx> // sched, keep_going
 
 #include <build2/test/script/lexer.hxx>
 #include <build2/test/script/runner.hxx>
@@ -3013,7 +3013,9 @@ namespace build2
                 // If the scope was executed synchronously, check the status
                 // and bail out if we weren't asked to keep going.
                 //
-                const diag_frame* df (diag_frame::stack); // UBSan workaround.
+                // UBSan workaround.
+                //
+                const diag_frame* df (diag_frame::stack ());
                 if (!sched.async (task_count,
                                   [] (const diag_frame* ds,
                                       scope& s,
diff --git a/build2/test/script/parser.hxx b/build2/test/script/parser.hxx
index 9ca0cf1..dfa1126 100644
--- a/build2/test/script/parser.hxx
+++ b/build2/test/script/parser.hxx
@@ -5,11 +5,11 @@
 #ifndef BUILD2_TEST_SCRIPT_PARSER_HXX
 #define BUILD2_TEST_SCRIPT_PARSER_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/parser.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/parser.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/test/script/token.hxx>
 #include <build2/test/script/script.hxx>
diff --git a/build2/test/script/parser.test.cxx b/build2/test/script/parser.test.cxx
index ea5da0a..352941a 100644
--- a/build2/test/script/parser.test.cxx
+++ b/build2/test/script/parser.test.cxx
@@ -5,12 +5,12 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
-#include <build2/context.hxx>   // reset()
-#include <build2/scheduler.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>   // reset()
+#include <libbuild2/scheduler.hxx>
 
 #include <build2/test/target.hxx>
 
diff --git a/build2/test/script/regex.hxx b/build2/test/script/regex.hxx
index 70de7ee..500c21b 100644
--- a/build2/test/script/regex.hxx
+++ b/build2/test/script/regex.hxx
@@ -12,8 +12,8 @@
 #include <type_traits>   // make_unsigned, enable_if, is_*
 #include <unordered_set>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 namespace build2
 {
diff --git a/build2/test/script/runner.cxx b/build2/test/script/runner.cxx
index 0d3716f..9031211 100644
--- a/build2/test/script/runner.cxx
+++ b/build2/test/script/runner.cxx
@@ -10,9 +10,9 @@
 #include <libbutl/regex.mxx>
 #include <libbutl/fdstream.mxx> // fdopen_mode, fdnull(), fddup()
 
-#include <build2/variable.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/test/common.hxx>
 
diff --git a/build2/test/script/runner.hxx b/build2/test/script/runner.hxx
index 843ff52..5f70dcc 100644
--- a/build2/test/script/runner.hxx
+++ b/build2/test/script/runner.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_TEST_SCRIPT_RUNNER_HXX
 #define BUILD2_TEST_SCRIPT_RUNNER_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/test/script/script.hxx>
 
diff --git a/build2/test/script/script.cxx b/build2/test/script/script.cxx
index 865c798..8e6351f 100644
--- a/build2/test/script/script.cxx
+++ b/build2/test/script/script.cxx
@@ -6,8 +6,8 @@
 
 #include <sstream>
 
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
 
 using namespace std;
 
diff --git a/build2/test/script/script.hxx b/build2/test/script/script.hxx
index 4da9d97..cc162cb 100644
--- a/build2/test/script/script.hxx
+++ b/build2/test/script/script.hxx
@@ -7,10 +7,10 @@
 
 #include <set>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/variable.hxx>
+#include <libbuild2/variable.hxx>
 
 #include <build2/test/target.hxx>
 
diff --git a/build2/test/script/token.hxx b/build2/test/script/token.hxx
index d239787..c79ef1b 100644
--- a/build2/test/script/token.hxx
+++ b/build2/test/script/token.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_SCRIPT_TOKEN_HXX
 #define BUILD2_TEST_SCRIPT_TOKEN_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/token.hxx>
+#include <libbuild2/token.hxx>
 
 namespace build2
 {
diff --git a/build2/test/target.hxx b/build2/test/target.hxx
index b8b2d3d..6cd07b9 100644
--- a/build2/test/target.hxx
+++ b/build2/test/target.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_TEST_TARGET_HXX
 #define BUILD2_TEST_TARGET_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
 namespace build2
 {
diff --git a/build2/types-parsers.hxx b/build2/types-parsers.hxx
index 5aa9d37..beea977 100644
--- a/build2/types-parsers.hxx
+++ b/build2/types-parsers.hxx
@@ -8,7 +8,7 @@
 #ifndef BUILD2_TYPES_PARSERS_HXX
 #define BUILD2_TYPES_PARSERS_HXX
 
-#include <build2/types.hxx>
+#include <libbuild2/types.hxx>
 
 namespace build2
 {
diff --git a/build2/version/init.cxx b/build2/version/init.cxx
index 77fb35d..8c9cd42 100644
--- a/build2/version/init.cxx
+++ b/build2/version/init.cxx
@@ -6,10 +6,10 @@
 
 #include <libbutl/manifest-parser.mxx>
 
-#include <build2/scope.hxx>
-#include <build2/context.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/config/utility.hxx>
 
diff --git a/build2/version/init.hxx b/build2/version/init.hxx
index 1e23371..ef3688a 100644
--- a/build2/version/init.hxx
+++ b/build2/version/init.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_VERSION_INIT_HXX
 #define BUILD2_VERSION_INIT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/version/module.hxx b/build2/version/module.hxx
index 1c6e637..d2b681c 100644
--- a/build2/version/module.hxx
+++ b/build2/version/module.hxx
@@ -7,10 +7,10 @@
 
 #include <map>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
 namespace build2
 {
diff --git a/build2/version/rule.cxx b/build2/version/rule.cxx
index 674defd..912efe3 100644
--- a/build2/version/rule.cxx
+++ b/build2/version/rule.cxx
@@ -4,9 +4,9 @@
 
 #include <build2/version/rule.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <build2/in/target.hxx>
 
diff --git a/build2/version/rule.hxx b/build2/version/rule.hxx
index 2813f87..8eb4830 100644
--- a/build2/version/rule.hxx
+++ b/build2/version/rule.hxx
@@ -5,8 +5,8 @@
 #ifndef BUILD2_VERSION_RULE_HXX
 #define BUILD2_VERSION_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <build2/in/rule.hxx>
 #include <build2/install/rule.hxx>
diff --git a/build2/version/snapshot.cxx b/build2/version/snapshot.cxx
index aa58a6e..b43e083 100644
--- a/build2/version/snapshot.cxx
+++ b/build2/version/snapshot.cxx
@@ -4,7 +4,7 @@
 
 #include <build2/version/snapshot.hxx>
 
-#include <build2/filesystem.hxx>
+#include <libbuild2/filesystem.hxx>
 
 using namespace std;
 
diff --git a/build2/version/snapshot.hxx b/build2/version/snapshot.hxx
index 78ad174..824ec89 100644
--- a/build2/version/snapshot.hxx
+++ b/build2/version/snapshot.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_VERSION_SNAPSHOT_HXX
 #define BUILD2_VERSION_SNAPSHOT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
+#include <libbuild2/scope.hxx>
 
 namespace build2
 {
diff --git a/build2/version/utility.cxx b/build2/version/utility.cxx
index 6c4d43e..8286ff8 100644
--- a/build2/version/utility.cxx
+++ b/build2/version/utility.cxx
@@ -7,7 +7,7 @@
 #include <libbutl/manifest-parser.mxx>
 #include <libbutl/manifest-serializer.mxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace butl;
 
diff --git a/build2/version/utility.hxx b/build2/version/utility.hxx
index 5baebeb..83bb91c 100644
--- a/build2/version/utility.hxx
+++ b/build2/version/utility.hxx
@@ -5,10 +5,10 @@
 #ifndef BUILD2_VERSION_UTILITY_HXX
 #define BUILD2_VERSION_UTILITY_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/filesystem.hxx>
+#include <libbuild2/filesystem.hxx>
 
 namespace build2
 {
diff --git a/libbuild2/.gitignore b/libbuild2/.gitignore
new file mode 100644
index 0000000..292d2f8
--- /dev/null
+++ b/libbuild2/.gitignore
@@ -0,0 +1,5 @@
+# Unit test executables and Testscript output directories
+# (can be symlinks).
+#
+*.test
+test-*.test
diff --git a/build2/action.hxx b/libbuild2/action.hxx
index eeb73fd..9fa2a16 100644
--- a/build2/action.hxx
+++ b/libbuild2/action.hxx
@@ -1,12 +1,14 @@
-// file      : build2/action.hxx -*- C++ -*-
+// file      : libbuild2/action.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_ACTION_HXX
-#define BUILD2_ACTION_HXX
+#ifndef LIBBUILD2_ACTION_HXX
+#define LIBBUILD2_ACTION_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -106,7 +108,7 @@ namespace build2
   bool operator>= (action, action) = delete;
   bool operator<= (action, action) = delete;
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, action); // operation.cxx
 
   // Inner/outer operation state container.
@@ -197,4 +199,4 @@ namespace build2
   enum class execution_mode {first, last};
 }
 
-#endif // BUILD2_ACTION_HXX
+#endif // LIBBUILD2_ACTION_HXX
diff --git a/build2/algorithm.cxx b/libbuild2/algorithm.cxx
index 892767a..963714b 100644
--- a/build2/algorithm.cxx
+++ b/libbuild2/algorithm.cxx
@@ -1,18 +1,18 @@
-// file      : build2/algorithm.cxx -*- C++ -*-
+// file      : libbuild2/algorithm.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/algorithm.hxx>
+#include <libbuild2/algorithm.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/rule.hxx>
-#include <build2/file.hxx> // import()
-#include <build2/search.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
-#include <build2/prerequisite.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/file.hxx> // import()
+#include <libbuild2/search.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
+#include <libbuild2/prerequisite.hxx>
 
 using namespace std;
 using namespace butl;
@@ -104,12 +104,27 @@ namespace build2
 
   // target_lock
   //
+  static
 #ifdef __cpp_thread_local
   thread_local
 #else
   __thread
 #endif
-  const target_lock* target_lock::stack = nullptr;
+  const target_lock* target_lock_stack = nullptr;
+
+  const target_lock* target_lock::
+  stack () noexcept
+  {
+    return target_lock_stack;
+  }
+
+  const target_lock* target_lock::
+  stack (const target_lock* s) noexcept
+  {
+    const target_lock* r (target_lock_stack);
+    target_lock_stack = s;
+    return r;
+  }
 
   // If the work_queue is absent, then we don't wait.
   //
@@ -601,8 +616,8 @@ namespace build2
                          }
                          catch (const failed&) {} // Phase lock failure.
                        },
-                       diag_frame::stack,
-                       target_lock::stack,
+                       diag_frame::stack (),
+                       target_lock::stack (),
                        ref (*ld.target),
                        ld.offset))
         return make_pair (true, target_state::postponed); // Queued.
@@ -798,11 +813,11 @@ namespace build2
 
   // Instantiate only for what we need.
   //
-  template void
+  template LIBBUILD2_SYMEXPORT void
   match_members<const target*> (action, target&,
                                 const target* const*, size_t);
 
-  template void
+  template LIBBUILD2_SYMEXPORT void
   match_members<prerequisite_target> (action, target&,
                                       prerequisite_target const*, size_t);
 
@@ -1580,7 +1595,7 @@ namespace build2
                            diag_frame::stack_guard dsg (ds);
                            execute_impl (a, t);
                          },
-                         diag_frame::stack,
+                         diag_frame::stack (),
                          ref (t)))
           return target_state::unknown; // Queued.
 
@@ -1763,19 +1778,19 @@ namespace build2
 
   // Instantiate only for what we need.
   //
-  template target_state
+  template LIBBUILD2_SYMEXPORT target_state
   straight_execute_members<const target*> (
     action, atomic_count&, const target*[], size_t, size_t);
 
-  template target_state
+  template LIBBUILD2_SYMEXPORT target_state
   reverse_execute_members<const target*> (
     action, atomic_count&, const target*[], size_t, size_t);
 
-  template target_state
+  template LIBBUILD2_SYMEXPORT target_state
   straight_execute_members<prerequisite_target> (
     action, atomic_count&, prerequisite_target[], size_t, size_t);
 
-  template target_state
+  template LIBBUILD2_SYMEXPORT target_state
   reverse_execute_members<prerequisite_target> (
     action, atomic_count&, prerequisite_target[], size_t, size_t);
 
diff --git a/build2/algorithm.hxx b/libbuild2/algorithm.hxx
index b246c37..50e8423 100644
--- a/build2/algorithm.hxx
+++ b/libbuild2/algorithm.hxx
@@ -1,15 +1,17 @@
-// file      : build2/algorithm.hxx -*- C++ -*-
+// file      : libbuild2/algorithm.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_ALGORITHM_HXX
-#define BUILD2_ALGORITHM_HXX
+#ifndef LIBBUILD2_ALGORITHM_HXX
+#define LIBBUILD2_ALGORITHM_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
-#include <build2/target.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/target.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -36,10 +38,10 @@ namespace build2
 
   // As above but specify the prerequisite to search as a key.
   //
-  const target&
+  LIBBUILD2_SYMEXPORT const target&
   search (const target&, const prerequisite_key&);
 
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   search_existing (const prerequisite_key&);
 
   // Uniform search interface for prerequisite/prerequisite_member.
@@ -91,13 +93,13 @@ namespace build2
   // first created a prerequisite based on this name in exactly the same way
   // as the parser would and then searched based on this prerequisite.
   //
-  const target&
+  LIBBUILD2_SYMEXPORT const target&
   search (const target&, name, const scope&);
 
   // Unlike the above version, this one can be called during the execute
   // phase. Return NULL for unknown target types.
   //
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   search_existing (const name&,
                    const scope&,
                    const dir_path& out = dir_path ());
@@ -108,7 +110,7 @@ namespace build2
   // maintain a stack of active locks in the current dependency chain (used to
   // detect dependency cycles).
   //
-  struct target_lock
+  struct LIBBUILD2_SYMEXPORT target_lock
   {
     using action_type = build2::action;
     using target_type = build2::target;
@@ -146,13 +148,16 @@ namespace build2
     data
     release ();
 
-    static
-#ifdef __cpp_thread_local
-    thread_local
-#else
-    __thread
-#endif
-    const target_lock* stack; // Tip of the stack.
+    // Tip of the stack.
+    //
+    static const target_lock*
+    stack () noexcept;
+
+    // Set the new and return the previous tip of the stack.
+    //
+    static const target_lock*
+    stack (const target_lock*) noexcept;
+
     const target_lock* prev;
 
     void
@@ -160,8 +165,8 @@ namespace build2
 
     struct stack_guard
     {
-      explicit stack_guard (const target_lock* s): s_ (stack) {stack = s;}
-      ~stack_guard () {stack = s_;}
+      explicit stack_guard (const target_lock* s): s_ (stack (s)) {}
+      ~stack_guard () {stack (s_);}
       const target_lock* s_;
     };
   };
@@ -198,7 +203,7 @@ namespace build2
   // things like changing the ad hoc member name by declaring it in a
   // buildfile.
   //
-  target&
+  LIBBUILD2_SYMEXPORT target&
   add_adhoc_member (target&,
                     const target_type&,
                     const dir_path& dir,
@@ -336,7 +341,7 @@ namespace build2
   // prerequisites for the clean operation. If this target is a member of a
   // group, then first do this to the group's prerequisites.
   //
-  using match_search =function<
+  using match_search = function<
     prerequisite_target (action,
                          const target&,
                          const prerequisite&,
@@ -433,7 +438,7 @@ namespace build2
   // the target is in src tree). This can be used, for example, to place
   // output into an otherwise non-existent directory.
   //
-  const fsdir*
+  LIBBUILD2_SYMEXPORT const fsdir*
   inject_fsdir (action, target&, bool parent = true);
 
   // Execute the action on target, assuming a rule has been matched and the
@@ -493,7 +498,7 @@ namespace build2
   // Note: waits for the completion if the target is busy and translates
   // target_state::failed to the failed exception.
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   execute_direct (action, const target&);
 
   // The default prerequisite execute implementation. Call execute_async() on
@@ -656,36 +661,36 @@ namespace build2
 
   // Return noop_recipe instead of using this function directly.
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   noop_action (action, const target&);
 
   // Default action implementation which forwards to the prerequisites.
   // Use default_recipe instead of using this function directly.
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   default_action (action, const target&);
 
   // Standard perform(clean) action implementation for the file target
   // (or derived).
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   perform_clean (action, const target&);
 
   // As above, but also removes the auxiliary dependency database (.d file).
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   perform_clean_depdb (action, const target&);
 
   // As above but clean the target group. The group should be an mtime_target
   // and members should be files.
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   perform_clean_group (action, const target&);
 
   // As above but clean both the target group and depdb. The depdb file path
   // is derived from the first member file path.
   //
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   perform_clean_group_depdb (action, const target&);
 
   // Helper for custom perform(clean) implementations that cleans extra files
@@ -721,7 +726,7 @@ namespace build2
 
   using clean_adhoc_extras = small_vector<clean_adhoc_extra, 2>;
 
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   perform_clean_extra (action, const file&,
                        const clean_extras&,
                        const clean_adhoc_extras& = {});
@@ -745,29 +750,29 @@ namespace build2
     overwrite  // Copy over but don't remove on clean (committed gen code).
   };
 
-  void
+  LIBBUILD2_SYMEXPORT void
   update_backlink (const file& target,
                    const path& link,
                    bool changed,
                    backlink_mode = backlink_mode::link);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   update_backlink (const path& target,
                    const path& link,
                    bool changed,
                    backlink_mode = backlink_mode::link);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   update_backlink (const path& target,
                    const path& link,
                    backlink_mode = backlink_mode::link);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   clean_backlink (const path& link,
                   uint16_t verbosity,
                   backlink_mode = backlink_mode::link);
 }
 
-#include <build2/algorithm.ixx>
+#include <libbuild2/algorithm.ixx>
 
-#endif // BUILD2_ALGORITHM_HXX
+#endif // LIBBUILD2_ALGORITHM_HXX
diff --git a/build2/algorithm.ixx b/libbuild2/algorithm.ixx
index c79ee49..7d68611 100644
--- a/build2/algorithm.ixx
+++ b/libbuild2/algorithm.ixx
@@ -1,9 +1,11 @@
-// file      : build2/algorithm.ixx -*- C++ -*-
+// file      : libbuild2/algorithm.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/rule.hxx>
-#include <build2/context.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/context.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -117,10 +119,10 @@ namespace build2
       t, T::static_type, dir, out, name, ext, scope).template as<T> ();
   }
 
-  target_lock
+  LIBBUILD2_SYMEXPORT target_lock
   lock_impl (action, const target&, optional<scheduler::work_queue>);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   unlock_impl (action, target&, size_t);
 
   inline target_lock::
@@ -128,10 +130,7 @@ namespace build2
       : action (a), target (t), offset (o)
   {
     if (target != nullptr)
-    {
-      prev = stack;
-      stack = this;
-    }
+      prev = stack (this);
   }
 
   inline void target_lock::
@@ -139,8 +138,8 @@ namespace build2
   {
     if (target != nullptr && prev != this)
     {
-      assert (stack == this);
-      stack = prev;
+      const target_lock* cur (stack (prev));
+      assert (cur == this);
       prev = this;
     }
   }
@@ -154,8 +153,8 @@ namespace build2
 
       if (prev != this)
       {
-        assert (stack == this);
-        stack = prev;
+        const target_lock* cur (stack (prev));
+        assert (cur == this);
       }
 
       target = nullptr;
@@ -171,8 +170,8 @@ namespace build2
     {
       if (prev != this)
       {
-        assert (stack == this);
-        stack = prev;
+        const target_lock* cur (stack (prev));
+        assert (cur == this);
       }
 
       target = nullptr;
@@ -195,9 +194,9 @@ namespace build2
     {
       if (x.prev != &x)
       {
-        assert (stack == &x);
+        const target_lock* cur (stack (this));
+        assert (cur == &x);
         prev = x.prev;
-        stack = this;
       }
       else
         prev = this;
@@ -221,9 +220,9 @@ namespace build2
       {
         if (x.prev != &x)
         {
-          assert (stack == &x);
+          const target_lock* cur (stack (this));
+          assert (cur == &x);
           prev = x.prev;
-          stack = this;
         }
         else
           prev = this;
@@ -238,7 +237,7 @@ namespace build2
   inline const target_lock*
   dependency_cycle (action a, const target& t)
   {
-    const target_lock* l (target_lock::stack);
+    const target_lock* l (target_lock::stack ());
 
     for (; l != nullptr; l = l->prev)
     {
@@ -291,13 +290,13 @@ namespace build2
     return m;
   }
 
-  const rule_match*
+  LIBBUILD2_SYMEXPORT const rule_match*
   match_impl (action, target&, const rule* skip, bool try_match = false);
 
-  recipe
+  LIBBUILD2_SYMEXPORT recipe
   apply_impl (action, target&, const rule_match&);
 
-  pair<bool, target_state>
+  LIBBUILD2_SYMEXPORT pair<bool, target_state>
   match (action, const target&, size_t, atomic_count*, bool try_match = false);
 
   inline void
@@ -470,7 +469,7 @@ namespace build2
     return match (a.inner_action (), t, um);
   }
 
-  group_view
+  LIBBUILD2_SYMEXPORT group_view
   resolve_members_impl (action, const target&, target_lock);
 
   inline group_view
@@ -508,7 +507,7 @@ namespace build2
     return r;
   }
 
-  void
+  LIBBUILD2_SYMEXPORT void
   resolve_group_impl (action, const target&, target_lock);
 
   inline const target*
@@ -540,10 +539,10 @@ namespace build2
     return t.group;
   }
 
-  void
+  LIBBUILD2_SYMEXPORT void
   match_prerequisites (action, target&, const match_search&, const scope*);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   match_prerequisite_members (action, target&,
                               const match_search_member&,
                               const scope*);
@@ -597,7 +596,7 @@ namespace build2
     match_prerequisite_members (a, t, nullptr, &s);
   }
 
-  target_state
+  LIBBUILD2_SYMEXPORT target_state
   execute (action, const target&, size_t, atomic_count*);
 
   inline target_state
@@ -708,7 +707,7 @@ namespace build2
   // If the first argument is NULL, then the result is treated as a boolean
   // value.
   //
-  pair<optional<target_state>, const target*>
+  LIBBUILD2_SYMEXPORT pair<optional<target_state>, const target*>
   execute_prerequisites (const target_type*,
                          action, const target&,
                          const timestamp&, const execute_filter&,
diff --git a/libbuild2/buildfile b/libbuild2/buildfile
new file mode 100644
index 0000000..99f616c
--- /dev/null
+++ b/libbuild2/buildfile
@@ -0,0 +1,85 @@
+# file      : libbuild2/buildfile
+# copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+import int_libs = libbutl%lib{butl}
+
+./: lib{build2}: libul{build2}: {hxx ixx txx cxx}{** -config      \
+                                                     -version     \
+                                                     -**.test...} \
+                                {hxx}{config version}             \
+                                $int_libs
+
+# Include the generated config and version headers into the distribution (so
+# that we don't pick up installed ones) and don't remove them when cleaning in
+# src (so that clean results in a state identical to distributed).
+#
+hxx{config}: in{config}
+hxx{version}: in{version} $src_root/manifest
+
+hxx{config version}:
+{
+  dist  = true
+  clean = ($src_root != $out_root)
+}
+
+# Unit tests.
+#
+exe{*.test}:
+{
+  test = true
+  install = false
+}
+
+for t: cxx{**.test...}
+{
+  d = $directory($t)
+  n = $name($t)...
+  b = $path.base($name($t))
+
+  ./: $d/exe{$n}: $t $d/{hxx ixx txx}{+$n} $d/testscript{+$n +$b+*.test...}
+  $d/exe{$n}: libul{build2}: bin.whole = false
+}
+
+# Build options.
+#
+obja{*}: cxx.poptions += -DLIBBUILD2_STATIC_BUILD
+objs{*}: cxx.poptions += -DLIBBUILD2_SHARED_BUILD
+
+# Pass our compiler target to be used as libbuild2 host.
+#
+obj{context}:  cxx.poptions += -DBUILD2_HOST_TRIPLET=\"$cxx.target\"
+obja{context}: cxx.poptions += -DLIBBUILD2_STATIC_BUILD
+objs{context}: cxx.poptions += -DLIBBUILD2_SHARED_BUILD
+
+if ($cxx.target.class != "windows")
+  cxx.libs += -lpthread
+
+# Export options.
+#
+lib{build2}:
+{
+  cxx.export.poptions = "-I$out_root" "-I$src_root"
+  cxx.export.libs = $int_libs
+}
+
+liba{build2}: cxx.export.poptions += -DLIBBUILD2_STATIC
+libs{build2}: cxx.export.poptions += -DLIBBUILD2_SHARED
+
+# For pre-releases use the complete version to make sure they cannot be used
+# in place of another pre-release or the final version. See the version module
+# for details on the version.* variable values.
+#
+if $version.pre_release
+  lib{build2}: bin.lib.version = @"-$version.project_id"
+else
+  lib{build2}: bin.lib.version = @"-$version.major.$version.minor"
+
+# Install into the libbuild2/ subdirectory of, say, /usr/include/
+# recreating subdirectories.
+#
+{hxx ixx txx}{*}:
+{
+  install         = include/libbuild2/
+  install.subdirs = true
+}
diff --git a/libbuild2/config.hxx b/libbuild2/config.hxx
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libbuild2/config.hxx
diff --git a/build2/config.hxx.in b/libbuild2/config.hxx.in
index 07499b1..62110da 100644
--- a/build2/config.hxx.in
+++ b/libbuild2/config.hxx.in
@@ -1,16 +1,16 @@
-// file      : build2/config.hxx.in -*- C++ -*-
+// file      : libbuild2/config.hxx.in -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-// This file is included by <build2/types.hxx> so normally you don't need to
-// include it directly. Note that this file is included unprocessed (i.e., as
-// an .in) during bootstrap.
+// This file is included by <libbuild2/types.hxx> so normally you don't need
+// to include it directly. Note that this file is included unprocessed (i.e.,
+// as an .in) during bootstrap.
 //
 // Also, note that some BUILD_* configuration macros are passed directly from
 // the buildfile with the -D options.
 
-#ifndef BUILD2_CONFIG_HXX
-#define BUILD2_CONFIG_HXX
+#ifndef LIBBUILD2_CONFIG_HXX
+#define LIBBUILD2_CONFIG_HXX
 
 // Currently the value is adjusted manually during release but in the future
 // the idea is to use version metadata (e.g., 1.2.3-a.1+0.stage). This way it
@@ -19,19 +19,19 @@
 // toolchain. Bootstrap will be a problem though. (Maybe set it to nullptr and
 // say that it shall not be queried?)
 //
-#define BUILD2_STAGE true
+#define LIBBUILD2_STAGE true
 
 // Modification time sanity checks are by default only enabled for the staged
 // version but this can be overridden at runtime with --[no-]mtime-check.
 //
-#if BUILD2_STAGE
-#  define BUILD2_MTIME_CHECK true
+#if LIBBUILD2_STAGE
+#  define LIBBUILD2_MTIME_CHECK true
 #else
-#  define BUILD2_MTIME_CHECK false
+#  define LIBBUILD2_MTIME_CHECK false
 #endif
 
 #ifdef BUILD2_BOOTSTRAP
 #else
 #endif
 
-#endif // BUILD2_CONFIG_HXX
+#endif // LIBBUILD2_CONFIG_HXX
diff --git a/build2/context.cxx b/libbuild2/context.cxx
index e71201d..d56abb3 100644
--- a/build2/context.cxx
+++ b/libbuild2/context.cxx
@@ -1,26 +1,24 @@
-// file      : build2/context.cxx -*- C++ -*-
+// file      : libbuild2/context.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/context.hxx>
+#include <libbuild2/context.hxx>
 
 #include <sstream>
 #include <exception> // uncaught_exception[s]()
 
-#include <build2/rule.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/rule.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <libbutl/ft/exception.hxx> // uncaught_exceptions
 
 // For command line variable parsing.
 //
-#include <build2/token.hxx>
-#include <build2/lexer.hxx>
-#include <build2/parser.hxx>
-
-#include <build2/config/operation.hxx> // config::preprocess_create().
+#include <libbuild2/token.hxx>
+#include <libbuild2/lexer.hxx>
+#include <libbuild2/parser.hxx>
 
 using namespace std;
 using namespace butl;
@@ -34,13 +32,6 @@ namespace build2
 
   size_t load_generation;
 
-#ifdef __cpp_thread_local
-  thread_local
-#else
-  __thread
-#endif
-  phase_lock* phase_lock::instance;
-
   bool phase_mutex::
   lock (run_phase p)
   {
@@ -216,11 +207,19 @@ namespace build2
 
   // phase_lock
   //
+  static
+#ifdef __cpp_thread_local
+  thread_local
+#else
+  __thread
+#endif
+  phase_lock* phase_lock_instance;
+
   phase_lock::
   phase_lock (run_phase p)
       : p (p)
   {
-    if (phase_lock* l = instance)
+    if (phase_lock* l = phase_lock_instance)
       assert (l->p == p);
     else
     {
@@ -230,7 +229,7 @@ namespace build2
         throw failed ();
       }
 
-      instance = this;
+      phase_lock_instance = this;
 
       //text << this_thread::get_id () << " phase acquire " << p;
     }
@@ -239,9 +238,9 @@ namespace build2
   phase_lock::
   ~phase_lock ()
   {
-    if (instance == this)
+    if (phase_lock_instance == this)
     {
-      instance = nullptr;
+      phase_lock_instance = nullptr;
       phase_mutex::instance.unlock (p);
 
       //text << this_thread::get_id () << " phase release " << p;
@@ -252,11 +251,11 @@ namespace build2
   //
   phase_unlock::
   phase_unlock (bool u)
-      : l (u ? phase_lock::instance : nullptr)
+      : l (u ? phase_lock_instance : nullptr)
   {
     if (u)
     {
-      phase_lock::instance = nullptr;
+      phase_lock_instance = nullptr;
       phase_mutex::instance.unlock (l->p);
 
       //text << this_thread::get_id () << " phase unlock  " << l->p;
@@ -269,7 +268,7 @@ namespace build2
     if (l != nullptr)
     {
       bool r (phase_mutex::instance.lock (l->p));
-      phase_lock::instance = l;
+      phase_lock_instance = l;
 
       // Fail unless we are already failing. Note that we keep the phase
       // locked since there will be phase_lock down the stack to unlock it.
@@ -293,7 +292,7 @@ namespace build2
       throw failed ();
     }
 
-    phase_lock::instance->p = n;
+    phase_lock_instance->p = n;
 
     if (n == run_phase::load) // Note: load lock is exclusive.
       load_generation++;
@@ -315,7 +314,7 @@ namespace build2
     }
 
     bool r (phase_mutex::instance.relock (n, o));
-    phase_lock::instance->p = o;
+    phase_lock_instance->p = o;
 
     // Similar logic to ~phase_unlock().
     //
@@ -366,6 +365,14 @@ namespace build2
   bool keep_going = false;
   bool dry_run = false;
 
+  void (*config_save_variable) (scope&, const variable&, uint64_t);
+
+  const string& (*config_preprocess_create) (const variable_overrides&,
+                                             values&,
+                                             vector_view<opspec>&,
+                                             bool,
+                                             const location&);
+
   variable_overrides
   reset (const strings& cmd_vars)
   {
@@ -386,15 +393,18 @@ namespace build2
     vp.clear ();
 
     // Reset meta/operation tables. Note that the order should match the id
-    // constants in <build2/operation.hxx>.
+    // constants in <libbuild2/operation.hxx>.
     //
     meta_operation_table.clear ();
     meta_operation_table.insert ("noop");
     meta_operation_table.insert ("perform");
     meta_operation_table.insert ("configure");
     meta_operation_table.insert ("disfigure");
-    meta_operation_table.insert (
-      meta_operation_data ("create", &config::preprocess_create));
+
+    if (config_preprocess_create != nullptr)
+      meta_operation_table.insert (
+        meta_operation_data ("create", config_preprocess_create));
+
     meta_operation_table.insert ("dist");
     meta_operation_table.insert ("info");
 
@@ -481,7 +491,7 @@ namespace build2
       // Note that it is either staged or public, without queued, since we do
       // not re-package things during the queued-to-public transition.
       //
-      set ("build.version.stage", BUILD2_STAGE);
+      set ("build.version.stage", LIBBUILD2_STAGE);
     }
 
     // Enter the host information. Rather than jumping through hoops like
diff --git a/build2/context.hxx b/libbuild2/context.hxx
index 5799eef..66874e7 100644
--- a/build2/context.hxx
+++ b/libbuild2/context.hxx
@@ -1,23 +1,25 @@
-// file      : build2/context.hxx -*- C++ -*-
+// file      : libbuild2/context.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_CONTEXT_HXX
-#define BUILD2_CONTEXT_HXX
+#ifndef LIBBUILD2_CONTEXT_HXX
+#define LIBBUILD2_CONTEXT_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/variable.hxx>
-#include <build2/operation.hxx>
-#include <build2/scheduler.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/operation.hxx>
+#include <libbuild2/scheduler.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
   // Main (and only) scheduler. Started up and shut down in main().
   //
-  extern scheduler sched;
+  LIBBUILD2_SYMEXPORT extern scheduler sched;
 
   // In order to perform each operation the build system goes through the
   // following phases:
@@ -50,8 +52,8 @@ namespace build2
   // various "nodes" to verify modifications are only done "within the
   // islands".
   //
-  extern run_phase phase;
-  extern size_t load_generation;
+  LIBBUILD2_SYMEXPORT extern run_phase phase;
+  LIBBUILD2_SYMEXPORT extern size_t load_generation;
 
   // A "tri-mutex" that keeps all the threads in one of the three phases. When
   // a thread wants to switch a phase, it has to wait for all the other
@@ -78,7 +80,7 @@ namespace build2
   // false. Note that in this case we still switch to the desired phase. See
   // the phase_{lock,switch,unlock} implementations for details.
   //
-  class phase_mutex
+  class LIBBUILD2_SYMEXPORT phase_mutex
   {
   public:
     // Acquire a phase lock potentially blocking (unless already in the
@@ -190,7 +192,7 @@ namespace build2
   // 3. Before calling wait(), we release our phase lock to allow switching
   //    the phase.
   //
-  struct phase_lock
+  struct LIBBUILD2_SYMEXPORT phase_lock
   {
     explicit phase_lock (run_phase);
     ~phase_lock ();
@@ -202,20 +204,12 @@ namespace build2
     phase_lock& operator= (const phase_lock&) = delete;
 
     run_phase p;
-
-    static
-#ifdef __cpp_thread_local
-    thread_local
-#else
-    __thread
-#endif
-    phase_lock* instance;
   };
 
   // Assuming we have a lock on the current phase, temporarily release it
   // and reacquire on destruction.
   //
-  struct phase_unlock
+  struct LIBBUILD2_SYMEXPORT phase_unlock
   {
     phase_unlock (bool unlock = true);
     ~phase_unlock () noexcept (false);
@@ -226,7 +220,7 @@ namespace build2
   // Assuming we have a lock on the current phase, temporarily switch to a
   // new phase and switch back on destruction.
   //
-  struct phase_switch
+  struct LIBBUILD2_SYMEXPORT phase_switch
   {
     explicit phase_switch (run_phase);
     ~phase_switch () noexcept (false);
@@ -270,23 +264,32 @@ namespace build2
   //
   // Note: consider printing in info meta-operation if adding anything here.
   //
-  extern const variable* var_src_root;
-  extern const variable* var_out_root;
-  extern const variable* var_src_base;
-  extern const variable* var_out_base;
-  extern const variable* var_forwarded;
+  LIBBUILD2_SYMEXPORT extern const variable* var_src_root;
+  LIBBUILD2_SYMEXPORT extern const variable* var_out_root;
+  LIBBUILD2_SYMEXPORT extern const variable* var_src_base;
+  LIBBUILD2_SYMEXPORT extern const variable* var_out_base;
+  LIBBUILD2_SYMEXPORT extern const variable* var_forwarded;
 
-  extern const variable* var_project;
-  extern const variable* var_amalgamation;
-  extern const variable* var_subprojects;
-  extern const variable* var_version;
+  LIBBUILD2_SYMEXPORT extern const variable* var_project;
+  LIBBUILD2_SYMEXPORT extern const variable* var_amalgamation;
+  LIBBUILD2_SYMEXPORT extern const variable* var_subprojects;
+  LIBBUILD2_SYMEXPORT extern const variable* var_version;
+
+  // project.url
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_project_url;
 
-  extern const variable* var_project_url;     // project.url
-  extern const variable* var_project_summary; // project.summary
+  // project.summary
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_project_summary;
 
-  extern const variable* var_import_target;   // import.target
+  // import.target
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_import_target;
 
-  extern const variable* var_clean;           // [bool] target visibility
+  // [bool] target visibility
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_clean;
 
   // Forwarded configuration backlink mode. Valid values are:
   //
@@ -299,7 +302,9 @@ namespace build2
   //
   // Note that it can be set by a matching rule as a rule-specific variable.
   //
-  extern const variable* var_backlink;        // [string] target visibility
+  // [string] target visibility
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_backlink;
 
   // Prerequisite inclusion/exclusion. Valid values are:
   //
@@ -324,13 +329,17 @@ namespace build2
   // To query this value in rule implementations use the include() helpers
   // from prerequisites.hxx.
   //
-  extern const variable* var_include;         // [string] prereq visibility
+  // [string] prereq visibility
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_include;
 
-  extern const char var_extension[10];        // "extension"
+  LIBBUILD2_SYMEXPORT extern const char var_extension[10]; // "extension"
 
   // The build.* namespace.
   //
-  extern const variable* var_build_meta_operation; // .meta_operation
+  // .meta_operation
+  //
+  LIBBUILD2_SYMEXPORT extern const variable* var_build_meta_operation;
 
   // Current action (meta/operation).
   //
@@ -338,23 +347,25 @@ namespace build2
   // lifted. The name is always for an outer operation (or meta operation
   // that hasn't been recognized as such yet).
   //
-  extern string current_mname;
-  extern string current_oname;
+  LIBBUILD2_SYMEXPORT extern string current_mname;
+  LIBBUILD2_SYMEXPORT extern string current_oname;
 
-  extern const meta_operation_info* current_mif;
-  extern const operation_info* current_inner_oif;
-  extern const operation_info* current_outer_oif;
-  extern size_t current_on; // Current operation number (1-based) in the
-                            // meta-operation batch.
+  LIBBUILD2_SYMEXPORT extern const meta_operation_info* current_mif;
+  LIBBUILD2_SYMEXPORT extern const operation_info* current_inner_oif;
+  LIBBUILD2_SYMEXPORT extern const operation_info* current_outer_oif;
+
+  // Current operation number (1-based) in the meta-operation batch.
+  //
+  LIBBUILD2_SYMEXPORT extern size_t current_on;
 
-  extern execution_mode current_mode;
+  LIBBUILD2_SYMEXPORT extern execution_mode current_mode;
 
   // Some diagnostics (for example output directory creation/removal by the
   // fsdir rule) is just noise at verbosity level 1 unless it is the only
   // thing that is printed. So we can only suppress it in certain situations
   // (e.g., dist) where we know we have already printed something.
   //
-  extern bool current_diag_noise;
+  LIBBUILD2_SYMEXPORT extern bool current_diag_noise;
 
   // Total number of dependency relationships and targets with non-noop
   // recipe in the current action.
@@ -368,9 +379,9 @@ namespace build2
   // skipped executing the operation, then it should increment the skip count.
   // These two counters are used for progress monitoring and diagnostics.
   //
-  extern atomic_count dependency_count;
-  extern atomic_count target_count;
-  extern atomic_count skip_count;
+  LIBBUILD2_SYMEXPORT extern atomic_count dependency_count;
+  LIBBUILD2_SYMEXPORT extern atomic_count target_count;
+  LIBBUILD2_SYMEXPORT extern atomic_count skip_count;
 
   inline void
   set_current_mif (const meta_operation_info& mif)
@@ -410,7 +421,7 @@ namespace build2
   // serially. In parallel we queue most of the things up before we see any
   // failures.
   //
-  extern bool keep_going;
+  LIBBUILD2_SYMEXPORT extern bool keep_going;
 
   // Dry run flag (see --dry-run|-n).
   //
@@ -443,12 +454,24 @@ namespace build2
   // from filesystem) that respect this flag in order not to end up with a
   // job half done.
   //
-  extern bool dry_run;
+  LIBBUILD2_SYMEXPORT extern bool dry_run;
+
+  // Config module entry points.
+  //
+  LIBBUILD2_SYMEXPORT extern void (*config_save_variable) (
+    scope&, const variable&, uint64_t flags);
+
+  LIBBUILD2_SYMEXPORT extern const string& (*config_preprocess_create) (
+    const variable_overrides&,
+    values&,
+    vector_view<opspec>&,
+    bool lifted,
+    const location&);
 
   // Reset the build state. In particular, this removes all the targets,
   // scopes, and variables.
   //
-  variable_overrides
+  LIBBUILD2_SYMEXPORT variable_overrides
   reset (const strings& cmd_vars);
 
   // Return the project name or empty string if unnamed.
@@ -463,17 +486,17 @@ namespace build2
   // Return the src/out directory corresponding to the given out/src. The
   // passed directory should be a sub-directory of out/src_root.
   //
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   src_out (const dir_path& out, const scope& root);
 
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   src_out (const dir_path& out,
            const dir_path& out_root, const dir_path& src_root);
 
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   out_src (const dir_path& src, const scope& root);
 
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   out_src (const dir_path& src,
            const dir_path& out_root, const dir_path& src_root);
 
@@ -498,10 +521,10 @@ namespace build2
     return os;
   }
 
-  string
+  LIBBUILD2_SYMEXPORT string
   diag_do (const action&);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   diag_do (ostream&, const action&, const target&);
 
   inline diag_phrase
@@ -510,10 +533,10 @@ namespace build2
     return diag_phrase {a, t, &diag_do};
   }
 
-  string
+  LIBBUILD2_SYMEXPORT string
   diag_doing (const action&);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   diag_doing (ostream&, const action&, const target&);
 
   inline diag_phrase
@@ -522,10 +545,10 @@ namespace build2
     return diag_phrase {a, t, &diag_doing};
   }
 
-  string
+  LIBBUILD2_SYMEXPORT string
   diag_did (const action&);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   diag_did (ostream&, const action&, const target&);
 
   inline diag_phrase
@@ -534,7 +557,7 @@ namespace build2
     return diag_phrase {a, t, &diag_did};
   }
 
-  void
+  LIBBUILD2_SYMEXPORT void
   diag_done (ostream&, const action&, const target&);
 
   inline diag_phrase
@@ -544,6 +567,6 @@ namespace build2
   }
 }
 
-#include <build2/context.ixx>
+#include <libbuild2/context.ixx>
 
-#endif // BUILD2_CONTEXT_HXX
+#endif // LIBBUILD2_CONTEXT_HXX
diff --git a/build2/context.ixx b/libbuild2/context.ixx
index 1c25922..f947bd7 100644
--- a/build2/context.ixx
+++ b/libbuild2/context.ixx
@@ -1,4 +1,4 @@
-// file      : build2/context.ixx -*- C++ -*-
+// file      : libbuild2/context.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/depdb.cxx b/libbuild2/depdb.cxx
index 607e85a..32e5916 100644
--- a/build2/depdb.cxx
+++ b/libbuild2/depdb.cxx
@@ -1,15 +1,15 @@
-// file      : build2/depdb.cxx -*- C++ -*-
+// file      : libbuild2/depdb.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/depdb.hxx>
+#include <libbuild2/depdb.hxx>
 
 #ifdef _WIN32
 #  include <libbutl/win32-utility.hxx>
 #endif
 
-#include <build2/filesystem.hxx>  // mtime()
-#include <build2/diagnostics.hxx>
+#include <libbuild2/filesystem.hxx>  // mtime()
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/depdb.hxx b/libbuild2/depdb.hxx
index 95d9f4b..8a1cd1f 100644
--- a/build2/depdb.hxx
+++ b/libbuild2/depdb.hxx
@@ -1,14 +1,16 @@
-// file      : build2/depdb.hxx -*- C++ -*-
+// file      : libbuild2/depdb.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_DEPDB_HXX
-#define BUILD2_DEPDB_HXX
+#ifndef LIBBUILD2_DEPDB_HXX
+#define LIBBUILD2_DEPDB_HXX
 
 #include <cstring> // strlen()
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -58,7 +60,7 @@ namespace build2
   // also used to handle the dry-run mode where we essentially do the
   // interruption ourselves.
   //
-  struct depdb_base
+  struct LIBBUILD2_SYMEXPORT depdb_base
   {
     explicit
     depdb_base (const path&, timestamp);
@@ -76,7 +78,7 @@ namespace build2
     butl::fdbuf* buf_; // Current buffer (for tellg()/tellp()).
   };
 
-  class depdb: private depdb_base
+  class LIBBUILD2_SYMEXPORT depdb: private depdb_base
   {
   public:
     using path_type = build2::path;
@@ -281,6 +283,6 @@ namespace build2
   };
 }
 
-#include <build2/depdb.ixx>
+#include <libbuild2/depdb.ixx>
 
-#endif // BUILD2_DEPDB_HXX
+#endif // LIBBUILD2_DEPDB_HXX
diff --git a/build2/depdb.ixx b/libbuild2/depdb.ixx
index cf67434..9f73fcb 100644
--- a/build2/depdb.ixx
+++ b/libbuild2/depdb.ixx
@@ -1,4 +1,4 @@
-// file      : build2/depdb.ixx -*- C++ -*-
+// file      : libbuild2/depdb.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
@@ -23,7 +23,7 @@ namespace build2
   inline bool depdb::
   mtime_check ()
   {
-    return mtime_check_option ? *mtime_check_option : BUILD2_MTIME_CHECK;
+    return mtime_check_option ? *mtime_check_option : LIBBUILD2_MTIME_CHECK;
   }
 
   inline void depdb::
diff --git a/build2/diagnostics.cxx b/libbuild2/diagnostics.cxx
index ac95c64..eab3b78 100644
--- a/build2/diagnostics.cxx
+++ b/libbuild2/diagnostics.cxx
@@ -1,8 +1,8 @@
-// file      : build2/diagnostics.cxx -*- C++ -*-
+// file      : libbuild2/diagnostics.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 #include <cstring>  // strchr()
 
@@ -53,12 +53,27 @@ namespace build2
 
   // Diagnostics stack.
   //
+  static
 #ifdef __cpp_thread_local
   thread_local
 #else
   __thread
 #endif
-  const diag_frame* diag_frame::stack = nullptr;
+  const diag_frame* diag_frame_stack = nullptr;
+
+  const diag_frame* diag_frame::
+  stack () noexcept
+  {
+    return diag_frame_stack;
+  }
+
+  const diag_frame* diag_frame::
+  stack (const diag_frame* f) noexcept
+  {
+    const diag_frame* r (diag_frame_stack);
+    diag_frame_stack = f;
+    return r;
+  }
 
   // Diagnostic facility, project specifics.
   //
diff --git a/build2/diagnostics.hxx b/libbuild2/diagnostics.hxx
index 992e741..9ad18ff 100644
--- a/build2/diagnostics.hxx
+++ b/libbuild2/diagnostics.hxx
@@ -1,14 +1,16 @@
-// file      : build2/diagnostics.hxx -*- C++ -*-
+// file      : libbuild2/diagnostics.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_DIAGNOSTICS_HXX
-#define BUILD2_DIAGNOSTICS_HXX
+#ifndef LIBBUILD2_DIAGNOSTICS_HXX
+#define LIBBUILD2_DIAGNOSTICS_HXX
 
 #include <libbutl/diagnostics.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -29,10 +31,10 @@ namespace build2
   // ...
   // nameN arg arg ... nullptr nullptr
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   print_process (diag_record&, const char* const* args, size_t n = 0);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   print_process (const char* const* args, size_t n = 0);
 
   inline void
@@ -126,7 +128,7 @@ namespace build2
       /*      */ stream_verbosity (0, 1);
   }
 
-  extern const int stream_verb_index;
+  LIBBUILD2_SYMEXPORT extern const int stream_verb_index;
 
   inline stream_verbosity
   stream_verb (ostream& os)
@@ -173,17 +175,14 @@ namespace build2
   // object optimization of std::function. So we have to complicate things
   // a bit here.
   //
-  struct diag_frame
+  struct LIBBUILD2_SYMEXPORT diag_frame
   {
     explicit
     diag_frame (void (*f) (const diag_frame&, const diag_record&))
         : func_ (f)
     {
       if (func_ != nullptr)
-      {
-        prev_ = stack;
-        stack = this;
-      }
+        prev_ = stack (this);
     }
 
     diag_frame (diag_frame&& x)
@@ -192,7 +191,7 @@ namespace build2
       if (func_ != nullptr)
       {
         prev_ = x.prev_;
-        stack = this;
+        stack (this);
 
         x.func_ = nullptr;
       }
@@ -206,28 +205,30 @@ namespace build2
     ~diag_frame ()
     {
       if (func_ != nullptr )
-        stack = prev_;
+        stack (prev_);
     }
 
     static void
     apply (const diag_record& r)
     {
-      for (const diag_frame* f (stack); f != nullptr; f = f->prev_)
+      for (const diag_frame* f (stack ()); f != nullptr; f = f->prev_)
         f->func_ (*f, r);
     }
 
-    static
-#ifdef __cpp_thread_local
-    thread_local
-#else
-    __thread
-#endif
-    const diag_frame* stack; // Tip of the stack.
+    // Tip of the stack.
+    //
+    static const diag_frame*
+    stack () noexcept;
+
+    // Set the new and return the previous tip of the stack.
+    //
+    static const diag_frame*
+    stack (const diag_frame*) noexcept;
 
     struct stack_guard
     {
-      explicit stack_guard (const diag_frame* s): s_ (stack) {stack = s;}
-      ~stack_guard () {stack = s_;}
+      explicit stack_guard (const diag_frame* s): s_ (stack (s)) {}
+      ~stack_guard () {stack (s_);}
       const diag_frame* s_;
     };
 
@@ -261,7 +262,7 @@ namespace build2
 
   // Diagnostic facility, project specifics.
   //
-  struct simple_prologue_base
+  struct LIBBUILD2_SYMEXPORT simple_prologue_base
   {
     explicit
     simple_prologue_base (const char* type,
@@ -280,7 +281,7 @@ namespace build2
     const stream_verbosity sverb_;
   };
 
-  struct location_prologue_base
+  struct LIBBUILD2_SYMEXPORT location_prologue_base
   {
     location_prologue_base (const char* type,
                             const char* mod,
@@ -367,10 +368,10 @@ namespace build2
   };
   using basic_mark = butl::diag_mark<basic_mark_base>;
 
-  extern const basic_mark error;
-  extern const basic_mark warn;
-  extern const basic_mark info;
-  extern const basic_mark text;
+  LIBBUILD2_SYMEXPORT extern const basic_mark error;
+  LIBBUILD2_SYMEXPORT extern const basic_mark warn;
+  LIBBUILD2_SYMEXPORT extern const basic_mark info;
+  LIBBUILD2_SYMEXPORT extern const basic_mark text;
 
   // trace
   //
@@ -428,8 +429,8 @@ namespace build2
   };
   using fail_end = butl::diag_noreturn_end<fail_end_base>;
 
-  extern const fail_mark fail;
-  extern const fail_end  endf;
+  LIBBUILD2_SYMEXPORT extern const fail_mark fail;
+  LIBBUILD2_SYMEXPORT extern const fail_end  endf;
 }
 
-#endif // BUILD2_DIAGNOSTICS_HXX
+#endif // LIBBUILD2_DIAGNOSTICS_HXX
diff --git a/build2/dump.cxx b/libbuild2/dump.cxx
index 3b5d205..a866fe3 100644
--- a/build2/dump.cxx
+++ b/libbuild2/dump.cxx
@@ -1,14 +1,14 @@
-// file      : build2/dump.cxx -*- C++ -*-
+// file      : libbuild2/dump.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/dump.hxx>
+#include <libbuild2/dump.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/variable.hxx>
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/dump.hxx b/libbuild2/dump.hxx
index f8e3d03..fd1886b 100644
--- a/build2/dump.hxx
+++ b/libbuild2/dump.hxx
@@ -1,14 +1,16 @@
-// file      : build2/dump.hxx -*- C++ -*-
+// file      : libbuild2/dump.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_DUMP_HXX
-#define BUILD2_DUMP_HXX
+#ifndef LIBBUILD2_DUMP_HXX
+#define LIBBUILD2_DUMP_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
+#include <libbuild2/action.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -19,14 +21,14 @@ namespace build2
   // rules have been matched for this action and dump action-specific
   // information (like rule-specific variables).
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   dump (optional<action> = nullopt);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   dump (const scope&, const char* ind = "");
 
-  void
+  LIBBUILD2_SYMEXPORT void
   dump (const target&, const char* ind = "");
 }
 
-#endif // BUILD2_DUMP_HXX
+#endif // LIBBUILD2_DUMP_HXX
diff --git a/libbuild2/export.hxx b/libbuild2/export.hxx
new file mode 100644
index 0000000..514c845
--- /dev/null
+++ b/libbuild2/export.hxx
@@ -0,0 +1,58 @@
+#pragma once
+
+// Normally we don't export class templates (but do complete specializations),
+// inline functions, and classes with only inline member functions. Exporting
+// classes that inherit from non-exported/imported bases (e.g., std::string)
+// will end up badly. The only known workarounds are to not inherit or to not
+// export. Also, MinGW GCC doesn't like seeing non-exported functions being
+// used before their inline definition. The workaround is to reorder code. In
+// the end it's all trial and error.
+//
+// Exportation of explicit template instantiations is even hairier: MinGW GCC
+// requires __declspec(dllexport) on the extern template declaration while VC
+// wants it on the definition. Use LIBBUILD2_{DEC,DEF}EXPORT for that.
+//
+
+#if defined(LIBBUILD2_STATIC)         // Using static.
+#  define LIBBUILD2_SYMEXPORT
+#  define LIBBUILD2_DECEXPORT
+#elif defined(LIBBUILD2_STATIC_BUILD) // Building static.
+#  define LIBBUILD2_SYMEXPORT
+#  define LIBBUILD2_DECEXPORT
+#  define LIBBUILD2_DEFEXPORT
+#elif defined(LIBBUILD2_SHARED)       // Using shared.
+#  ifdef _WIN32
+#    define LIBBUILD2_SYMEXPORT __declspec(dllimport)
+#    define LIBBUILD2_DECEXPORT __declspec(dllimport)
+#  else
+#    define LIBBUILD2_SYMEXPORT
+#    define LIBBUILD2_DECEXPORT
+#  endif
+#elif defined(LIBBUILD2_SHARED_BUILD) // Building shared.
+#  ifdef _WIN32
+#    define LIBBUILD2_SYMEXPORT __declspec(dllexport)
+#    if defined(_MSC_VER)
+#      define LIBBUILD2_DECEXPORT
+#      define LIBBUILD2_DEFEXPORT __declspec(dllexport)
+#    else
+#      define LIBBUILD2_DECEXPORT __declspec(dllexport)
+#      define LIBBUILD2_DEFEXPORT
+#    endif
+#  else
+#    define LIBBUILD2_SYMEXPORT
+#    define LIBBUILD2_DECEXPORT
+#    define LIBBUILD2_DEFEXPORT
+#  endif
+#else
+// If none of the above macros are defined, then we assume we are being used
+// by some third-party build system that cannot/doesn't signal the library
+// type. Note that this fallback works for both static and shared but in case
+// of shared will be sub-optimal compared to having dllimport. Also note that
+// bootstrap ends up here as well.
+//
+// Using static or shared.
+//
+#  define LIBBUILD2_SYMEXPORT
+#  define LIBBUILD2_DECEXPORT
+#  define LIBBUILD2_DEFEXPORT
+#endif
diff --git a/build2/file.cxx b/libbuild2/file.cxx
index 8c7c74c..5966168 100644
--- a/build2/file.cxx
+++ b/libbuild2/file.cxx
@@ -1,23 +1,21 @@
-// file      : build2/file.cxx -*- C++ -*-
+// file      : libbuild2/file.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/file.hxx>
+#include <libbuild2/file.hxx>
 
 #include <iostream> // cin
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>   // exists()
-#include <build2/prerequisite.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>   // exists()
+#include <libbuild2/prerequisite.hxx>
+#include <libbuild2/diagnostics.hxx>
 
-#include <build2/token.hxx>
-#include <build2/lexer.hxx>
-#include <build2/parser.hxx>
-
-#include <build2/config/utility.hxx>
+#include <libbuild2/token.hxx>
+#include <libbuild2/lexer.hxx>
+#include <libbuild2/parser.hxx>
 
 using namespace std;
 using namespace butl;
@@ -1292,7 +1290,11 @@ namespace build2
         if (auto l = iroot[var])
         {
           out_root = cast<dir_path> (l);      // Normalized and actualized.
-          config::save_variable (iroot, var); // Mark as part of config.
+
+          // Mark as part of config.
+          //
+          if (config_save_variable != nullptr)
+            config_save_variable (iroot, var, 0 /* flags */);
 
           // Empty config.import.* value means don't look in subprojects or
           // amalgamations and go straight to the rule-specific import (e.g.,
@@ -1331,7 +1333,8 @@ namespace build2
             if (r.empty ())
               fail (loc) << "empty path in " << var.name;
 
-            config::save_variable (iroot, var);
+            if (config_save_variable != nullptr)
+              config_save_variable (iroot, var, 0 /* flags */);
           }
 
           return r;
diff --git a/build2/file.hxx b/libbuild2/file.hxx
index c46d2d5..e2e8aaa 100644
--- a/build2/file.hxx
+++ b/libbuild2/file.hxx
@@ -1,17 +1,19 @@
-// file      : build2/file.hxx -*- C++ -*-
+// file      : libbuild2/file.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_FILE_HXX
-#define BUILD2_FILE_HXX
+#ifndef LIBBUILD2_FILE_HXX
+#define LIBBUILD2_FILE_HXX
 
 #include <map>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/variable.hxx> // list_value
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx> // list_value
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -21,15 +23,21 @@ namespace build2
 
   using subprojects = std::map<project_name, dir_path>;
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const subprojects&); // Print as name@dir sequence.
 
-  extern const dir_path std_build_dir;  // build/
-  extern const path std_root_file;      // build/root.build
-  extern const path std_bootstrap_file; // build/bootstrap.build
+  LIBBUILD2_SYMEXPORT extern const dir_path std_build_dir;  // build/
+
+  // build/root.build
+  //
+  LIBBUILD2_SYMEXPORT extern const path std_root_file;
+
+  // build/bootstrap.build
+  //
+  LIBBUILD2_SYMEXPORT extern const path std_bootstrap_file;
 
-  extern const path std_buildfile_file; // buildfile
-  extern const path alt_buildfile_file; // build2file
+  LIBBUILD2_SYMEXPORT extern const path std_buildfile_file; // buildfile
+  LIBBUILD2_SYMEXPORT extern const path alt_buildfile_file; // build2file
 
   // If the altn argument value is present, then it indicates whether we are
   // using the standard or the alternative build file/directory naming.
@@ -39,10 +47,10 @@ namespace build2
   // naming scheme (by setting altn) and from then on all the remaining tests
   // only look for things in this scheme.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   is_src_root (const dir_path&, optional<bool>& altn);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   is_out_root (const dir_path&, optional<bool>& altn);
 
   // Given an src_base directory, look for a project's src_root based on the
@@ -50,7 +58,7 @@ namespace build2
   // that if the input is normalized/actualized, then the output will be as
   // well.
   //
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   find_src_root (const dir_path&, optional<bool>& altn);
 
   // The same as above but for project's out. Note that we also check whether
@@ -58,17 +66,17 @@ namespace build2
   // the result returned as the second half of the pair. Note also that if the
   // input is normalized/actualized, then the output will be as well.
   //
-  pair<dir_path, bool>
+  LIBBUILD2_SYMEXPORT pair<dir_path, bool>
   find_out_root (const dir_path&, optional<bool>& altn);
 
   // The old/new src_root paths. See main() (where they are set) for details.
   //
-  extern dir_path old_src_root;
-  extern dir_path new_src_root;
+  LIBBUILD2_SYMEXPORT extern dir_path old_src_root;
+  LIBBUILD2_SYMEXPORT extern dir_path new_src_root;
 
   // If buildfile is '-', then read from STDIN.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   source (scope& root, scope& base, const path&);
 
   // As above but first check if this buildfile has already been sourced for
@@ -79,25 +87,25 @@ namespace build2
 
   // As above but checks against the specified scope rather than base.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   source_once (scope& root, scope& base, const path&, scope& once);
 
   // Create project's root scope. Only set the src_root variable if the passed
   // src_root value is not empty. The scope argument is only used as proof of
   // lock.
   //
-  scope_map::iterator
+  LIBBUILD2_SYMEXPORT scope_map::iterator
   create_root (scope&, const dir_path& out_root, const dir_path& src_root);
 
   // Setup root scope. Note that it assumes the src_root variable has already
   // been set.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   setup_root (scope&, bool forwarded);
 
   // Setup the base scope (set *_base variables, etc).
   //
-  scope&
+  LIBBUILD2_SYMEXPORT scope&
   setup_base (scope_map::iterator,
               const dir_path& out_base,
               const dir_path& src_base);
@@ -107,7 +115,7 @@ namespace build2
   // the new scope is in another project. If the new scope is not in any
   // project, then NULL is returned in second.
   //
-  pair<scope&, scope*>
+  LIBBUILD2_SYMEXPORT pair<scope&, scope*>
   switch_scope (scope& root, const dir_path&);
 
   // Bootstrap and optionally load an ad hoc (sub)project (i.e., the kind that
@@ -120,7 +128,7 @@ namespace build2
   //
   // The scope argument is only used as proof of lock.
   //
-  scope&
+  LIBBUILD2_SYMEXPORT scope&
   load_project (scope&,
                 const dir_path& out_root,
                 const dir_path& src_root,
@@ -131,18 +139,18 @@ namespace build2
   // src_root if there is no forward. See is_{src,out}_root() for the altn
   // argument semantics.
   //
-  dir_path
+  LIBBUILD2_SYMEXPORT dir_path
   bootstrap_fwd (const dir_path& src_root, optional<bool>& altn);
 
   // Bootstrap the project's root scope, the out part.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   bootstrap_out (scope& root, optional<bool>& altn);
 
   // Bootstrap the project's root scope, the src part. Return true if we
   // loaded anything (which confirms the src_root is not bogus).
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   bootstrap_src (scope& root, optional<bool>& altn);
 
   // Return true if this scope has already been bootstrapped, that is, the
@@ -152,22 +160,22 @@ namespace build2
   //   setup_root()
   //   bootstrap_src()
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   bootstrapped (scope& root);
 
   // Execute pre/post-bootstrap hooks. Similar to bootstrap_out/sr(), should
   // only be called once per project bootstrap.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   bootstrap_pre (scope& root, optional<bool>& altn);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   bootstrap_post (scope& root);
 
   // Create and bootstrap outer root scopes, if any. Loading is done by
   // load_root().
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   create_bootstrap_outer (scope& root);
 
   // Create and bootstrap inner root scopes, if any, recursively.
@@ -177,14 +185,14 @@ namespace build2
   //
   // Note that loading is done by load_root().
   //
-  scope&
+  LIBBUILD2_SYMEXPORT scope&
   create_bootstrap_inner (scope& root, const dir_path& out_base = dir_path ());
 
   // Load project's root.build (and root pre/post hooks) unless already
   // loaded. Also make sure all outer root scopes are loaded prior to loading
   // this root scope.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   load_root (scope& root);
 
   // Extract the specified variable value from a buildfile. It is expected to
@@ -192,7 +200,7 @@ namespace build2
   // other than those from the global scope or any variable overrides. Return
   // an indication of whether the variable was found.
   //
-  pair<value, bool>
+  LIBBUILD2_SYMEXPORT pair<value, bool>
   extract_variable (const path&, const variable&);
 
   // Import has two phases: the first is triggered by the import
@@ -215,7 +223,7 @@ namespace build2
   // there is a package foo available in repository bar. Wanna
   // download and use it?"
   //
-  names
+  LIBBUILD2_SYMEXPORT names
   import (scope& base, name, const location&);
 
   const target&
@@ -230,6 +238,6 @@ namespace build2
   import_existing (const prerequisite_key&);
 }
 
-#include <build2/file.ixx>
+#include <libbuild2/file.ixx>
 
-#endif // BUILD2_FILE_HXX
+#endif // LIBBUILD2_FILE_HXX
diff --git a/build2/file.ixx b/libbuild2/file.ixx
index a94d605..f8a79be 100644
--- a/build2/file.ixx
+++ b/libbuild2/file.ixx
@@ -1,7 +1,9 @@
-// file      : build2/file.ixx -*- C++ -*-
+// file      : libbuild2/file.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
   inline bool
@@ -10,7 +12,7 @@ namespace build2
     return source_once (root, base, bf, base);
   }
 
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   import (const prerequisite_key&, bool existing);
 
   inline const target&
diff --git a/build2/filesystem.cxx b/libbuild2/filesystem.cxx
index 7242347..83408fa 100644
--- a/build2/filesystem.cxx
+++ b/libbuild2/filesystem.cxx
@@ -1,11 +1,11 @@
-// file      : build2/filesystem.cxx -*- C++ -*-
+// file      : libbuild2/filesystem.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/filesystem.hxx>
+#include <libbuild2/filesystem.hxx>
 
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/filesystem.hxx b/libbuild2/filesystem.hxx
index 2ba928c..6dca528 100644
--- a/build2/filesystem.hxx
+++ b/libbuild2/filesystem.hxx
@@ -1,14 +1,16 @@
-// file      : build2/filesystem.hxx -*- C++ -*-
+// file      : libbuild2/filesystem.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_FILESYSTEM_HXX
-#define BUILD2_FILESYSTEM_HXX
+#ifndef LIBBUILD2_FILESYSTEM_HXX
+#define LIBBUILD2_FILESYSTEM_HXX
 
 #include <libbutl/filesystem.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 // Higher-level filesystem utilities built on top of <libbutl/filesystem.mxx>.
 //
@@ -40,14 +42,14 @@ namespace build2
   // specified verbosity level. If the file does not exist and create is true,
   // create it and fail otherwise.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   touch (const path&, bool create, uint16_t verbosity = 1);
 
   // Return the modification time for an existing regular file and
   // timestamp_nonexistent otherwise. Print the diagnostics and fail on system
   // error.
   //
-  timestamp
+  LIBBUILD2_SYMEXPORT timestamp
   mtime (const char*);
 
   inline timestamp
@@ -69,10 +71,10 @@ namespace build2
   //
   using mkdir_status = butl::mkdir_status;
 
-  fs_status<mkdir_status>
+  LIBBUILD2_SYMEXPORT fs_status<mkdir_status>
   mkdir (const dir_path&, uint16_t verbosity = 1);
 
-  fs_status<mkdir_status>
+  LIBBUILD2_SYMEXPORT fs_status<mkdir_status>
   mkdir_p (const dir_path&, uint16_t verbosity = 1);
 
   // Remove the file (unless dry-run) and print the standard diagnostics
@@ -100,7 +102,7 @@ namespace build2
 
   // Similar to rmfile() but for symlinks.
   //
-  fs_status<rmfile_status>
+  LIBBUILD2_SYMEXPORT fs_status<rmfile_status>
   rmsymlink (const path&, bool dir, uint16_t verbosity);
 
   // Similar to rmfile() but for directories (note: not -r).
@@ -130,19 +132,19 @@ namespace build2
   //
   // @@ Collides (via ADL) with butl::rmdir_r(), which sucks.
   //
-  fs_status<rmdir_status>
+  LIBBUILD2_SYMEXPORT fs_status<rmdir_status>
   rmdir_r (const dir_path&, bool dir = true, uint16_t verbosity = 1);
 
   // Check for a file, directory or filesystem entry existence. Print the
   // diagnostics and fail on system error, unless ignore_error is true.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   exists (const path&, bool follow_symlinks = true, bool ignore_error = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   exists (const dir_path&, bool ignore_error = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   entry_exists (const path&,
                 bool follow_symlinks = false,
                 bool ignore_error = false);
@@ -150,7 +152,7 @@ namespace build2
   // Check for a directory emptiness. Print the diagnostics and fail on system
   // error.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   empty (const dir_path&);
 
   // Directories containing .buildignore (or .build2ignore in the alternative
@@ -160,21 +162,21 @@ namespace build2
 
   // Create a directory containing an empty .buildignore file.
   //
-  fs_status<mkdir_status>
+  LIBBUILD2_SYMEXPORT fs_status<mkdir_status>
   mkdir_buildignore (const dir_path&, const path&, uint16_t verbosity = 1);
 
   // Return true if the directory is empty or only contains the .buildignore
   // file. Fail if the directory doesn't exist.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   empty_buildignore (const dir_path&, const path&);
 
   // Remove a directory if it is empty or only contains the .buildignore file.
   //
-  fs_status<rmdir_status>
+  LIBBUILD2_SYMEXPORT fs_status<rmdir_status>
   rmdir_buildignore (const dir_path&, const path&, uint16_t verbosity = 1);
 }
 
-#include <build2/filesystem.txx>
+#include <libbuild2/filesystem.txx>
 
-#endif // BUILD2_FILESYSTEM_HXX
+#endif // LIBBUILD2_FILESYSTEM_HXX
diff --git a/build2/filesystem.txx b/libbuild2/filesystem.txx
index 919a26e..6166082 100644
--- a/build2/filesystem.txx
+++ b/libbuild2/filesystem.txx
@@ -1,11 +1,11 @@
-// file      : build2/filesystem.txx -*- C++ -*-
+// file      : libbuild2/filesystem.txx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <type_traits> // is_base_of
 
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 namespace build2
 {
diff --git a/build2/function+call.test.testscript b/libbuild2/function+call.test.testscript
index 1678c28..755572e 100644
--- a/build2/function+call.test.testscript
+++ b/libbuild2/function+call.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/function+call.test.testscript
+# file      : libbuild2/function+call.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/function+syntax.test.testscript b/libbuild2/function+syntax.test.testscript
index bd86dd0..f8240f3 100644
--- a/build2/function+syntax.test.testscript
+++ b/libbuild2/function+syntax.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/function+syntax.test.testscript
+# file      : libbuild2/function+syntax.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/function.cxx b/libbuild2/function.cxx
index e78cade..2d4dce9 100644
--- a/build2/function.cxx
+++ b/libbuild2/function.cxx
@@ -1,8 +1,8 @@
-// file      : build2/function.cxx -*- C++ -*-
+// file      : libbuild2/function.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
+#include <libbuild2/function.hxx>
 
 #include <cstring> // strchr()
 
@@ -323,7 +323,7 @@ namespace build2
     return d->thunk (base, move (args), d);
   }
 
-#if !defined(_MSC_VER) || _MSC_VER > 1910
+#if !defined(_WIN32)
   constexpr const optional<const value_type*>* function_args<>::types;
 #else
   const optional<const value_type*>* const function_args<>::types = nullptr;
diff --git a/build2/function.hxx b/libbuild2/function.hxx
index 1b49f81..6b2bfe1 100644
--- a/build2/function.hxx
+++ b/libbuild2/function.hxx
@@ -1,19 +1,21 @@
-// file      : build2/function.hxx -*- C++ -*-
+// file      : libbuild2/function.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_FUNCTION_HXX
-#define BUILD2_FUNCTION_HXX
+#ifndef LIBBUILD2_FUNCTION_HXX
+#define LIBBUILD2_FUNCTION_HXX
 
 #include <map>
 #include <utility>       // index_sequence
 #include <type_traits>   // aligned_storage
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -85,7 +87,7 @@ namespace build2
                                vector_view<value>,
                                const function_overload&);
 
-  struct function_overload
+  struct LIBBUILD2_SYMEXPORT function_overload
   {
     const char* name;     // Set to point to key by insert() below.
     const char* alt_name; // Alternative name, NULL if none. This is the
@@ -145,10 +147,10 @@ namespace build2
     }
   };
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const function_overload&); // Print signature.
 
-  class function_map
+  class LIBBUILD2_SYMEXPORT function_map
   {
   public:
     using map_type = std::multimap<string, function_overload>;
@@ -214,9 +216,9 @@ namespace build2
     map_type map_;
   };
 
-  extern function_map functions;
+  LIBBUILD2_SYMEXPORT extern function_map functions;
 
-  class function_family
+  class LIBBUILD2_SYMEXPORT function_family
   {
   public:
     // The call() function above catches invalid_argument and issues
@@ -282,7 +284,7 @@ namespace build2
   };
 
   template <>
-  struct function_arg<names> // Untyped.
+  struct LIBBUILD2_SYMEXPORT function_arg<names> // Untyped.
   {
     static const bool null = false;
     static const bool opt = false;
@@ -301,7 +303,7 @@ namespace build2
   };
 
   template <>
-  struct function_arg<value> // Anytyped.
+  struct LIBBUILD2_SYMEXPORT function_arg<value> // Anytyped.
   {
     static const bool null = false;
     static const bool opt = false;
@@ -341,7 +343,7 @@ namespace build2
   };
 
   template <>
-  struct function_arg<value*>: function_arg<value>
+  struct LIBBUILD2_SYMEXPORT function_arg<value*>: function_arg<value>
   {
     static const bool null = true;
 
@@ -388,7 +390,13 @@ namespace build2
     // VC15 doesn't realize that a pointer to static object (in our case it is
     // &value_trair<T>::value_type) is constexpr.
     //
-#if !defined(_MSC_VER) || _MSC_VER > 1910
+    // Note that during the library split we discovered that the constexpr
+    // variant causes compilation/linkage issues for both MinGW GCC and
+    // VC. Thus we now only use it for POSIX systems.
+    //
+    // #if !defined(_MSC_VER) || _MSC_VER > 1910
+    //
+#if !defined(_WIN32)
     static constexpr const optional<const value_type*> types[max] = {
       function_arg<A>::type ()...};
 #else
@@ -397,7 +405,7 @@ namespace build2
   };
 
   template <typename... A>
-#if !defined(_MSC_VER) || _MSC_VER > 1910
+#if !defined(_WIN32)
   constexpr const optional<const value_type*>
   function_args<A...>::types[function_args<A...>::max];
 #else
@@ -409,12 +417,12 @@ namespace build2
   // Specialization for no arguments.
   //
   template <>
-  struct function_args<>
+  struct LIBBUILD2_SYMEXPORT function_args<>
   {
     static const size_t max = 0;
     static const size_t min = 0;
 
-#if !defined(_MSC_VER) || _MSC_VER > 1910
+#if !defined(_WIN32)
     static constexpr const optional<const value_type*>* types = nullptr;
 #else
     static const optional<const value_type*>* const types;
@@ -734,7 +742,7 @@ namespace build2
     }
   };
 
-  struct function_family::entry
+  struct LIBBUILD2_SYMEXPORT function_family::entry
   {
     string name;
     const string& qual;
@@ -894,4 +902,4 @@ namespace build2
   }
 }
 
-#endif // BUILD2_FUNCTION_HXX
+#endif // LIBBUILD2_FUNCTION_HXX
diff --git a/build2/function.test.cxx b/libbuild2/function.test.cxx
index b890bcd..5e442a3 100644
--- a/build2/function.test.cxx
+++ b/libbuild2/function.test.cxx
@@ -1,17 +1,17 @@
-// file      : build2/function.test.cxx -*- C++ -*-
+// file      : libbuild2/function.test.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/parser.hxx>
-#include <build2/context.hxx>
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/parser.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-builtin.cxx b/libbuild2/functions-builtin.cxx
index 138a364..44ae534 100644
--- a/build2/functions-builtin.cxx
+++ b/libbuild2/functions-builtin.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-builtin.cxx -*- C++ -*-
+// file      : libbuild2/functions-builtin.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 namespace build2
 {
diff --git a/build2/functions-filesystem.cxx b/libbuild2/functions-filesystem.cxx
index a3b2a40..d98c75d 100644
--- a/build2/functions-filesystem.cxx
+++ b/libbuild2/functions-filesystem.cxx
@@ -1,11 +1,11 @@
-// file      : build2/functions-filesystem.cxx -*- C++ -*-
+// file      : libbuild2/functions-filesystem.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <libbutl/filesystem.mxx>
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-name.cxx b/libbuild2/functions-name.cxx
index ba1af5b..a8e08b6 100644
--- a/build2/functions-name.cxx
+++ b/libbuild2/functions-name.cxx
@@ -1,10 +1,10 @@
-// file      : build2/functions-name.cxx -*- C++ -*-
+// file      : libbuild2/functions-name.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scope.hxx>
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-path.cxx b/libbuild2/functions-path.cxx
index 6b435f5..6e39812 100644
--- a/build2/functions-path.cxx
+++ b/libbuild2/functions-path.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-path.cxx -*- C++ -*-
+// file      : libbuild2/functions-path.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-process-path.cxx b/libbuild2/functions-process-path.cxx
index bf9b417..65e426b 100644
--- a/build2/functions-process-path.cxx
+++ b/libbuild2/functions-process-path.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-process-path.cxx -*- C++ -*-
+// file      : libbuild2/functions-process-path.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-process.cxx b/libbuild2/functions-process.cxx
index b302ae5..83188d3 100644
--- a/build2/functions-process.cxx
+++ b/libbuild2/functions-process.cxx
@@ -1,11 +1,11 @@
-// file      : build2/functions-process.cxx -*- C++ -*-
+// file      : libbuild2/functions-process.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <libbutl/regex.mxx>
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/functions-project-name.cxx b/libbuild2/functions-project-name.cxx
index 65f263b..163e865 100644
--- a/build2/functions-project-name.cxx
+++ b/libbuild2/functions-project-name.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-project-name.cxx -*- C++ -*-
+// file      : libbuild2/functions-project-name.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-regex.cxx b/libbuild2/functions-regex.cxx
index 3f44e8a..2c478fe 100644
--- a/build2/functions-regex.cxx
+++ b/libbuild2/functions-regex.cxx
@@ -1,4 +1,4 @@
-// file      : build2/functions-regex.cxx -*- C++ -*-
+// file      : libbuild2/functions-regex.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
@@ -6,8 +6,8 @@
 
 #include <libbutl/regex.mxx>
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/functions-string.cxx b/libbuild2/functions-string.cxx
index 61fd536..22860cb 100644
--- a/build2/functions-string.cxx
+++ b/libbuild2/functions-string.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-string.cxx -*- C++ -*-
+// file      : libbuild2/functions-string.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/functions-target-triplet.cxx b/libbuild2/functions-target-triplet.cxx
index de0387a..4394c5a 100644
--- a/build2/functions-target-triplet.cxx
+++ b/libbuild2/functions-target-triplet.cxx
@@ -1,9 +1,9 @@
-// file      : build2/functions-target-triplet.cxx -*- C++ -*-
+// file      : libbuild2/functions-target-triplet.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
 
 using namespace std;
 
diff --git a/build2/lexer+buildspec.test.testscript b/libbuild2/lexer+buildspec.test.testscript
index 9083abe..a80b2d5 100644
--- a/build2/lexer+buildspec.test.testscript
+++ b/libbuild2/lexer+buildspec.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/lexer+buildspec.test.testscript
+# file      : libbuild2/lexer+buildspec.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/lexer+comment.test.testscript b/libbuild2/lexer+comment.test.testscript
index 4323c84..6ad1202 100644
--- a/build2/lexer+comment.test.testscript
+++ b/libbuild2/lexer+comment.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/lexer+comment.test.testscript
+# file      : libbuild2/lexer+comment.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/lexer+eval.test.testscript b/libbuild2/lexer+eval.test.testscript
index eccd029..86f804a 100644
--- a/build2/lexer+eval.test.testscript
+++ b/libbuild2/lexer+eval.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/lexer+eval.test.testscript
+# file      : libbuild2/lexer+eval.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/lexer+quoting.test.testscript b/libbuild2/lexer+quoting.test.testscript
index 21b9046..043737f 100644
--- a/build2/lexer+quoting.test.testscript
+++ b/libbuild2/lexer+quoting.test.testscript
@@ -1,4 +1,4 @@
-# file      : build2/lexer+quoting.test.testscript
+# file      : libbuild2/lexer+quoting.test.testscript
 # copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/lexer.cxx b/libbuild2/lexer.cxx
index 8287640..fd13c31 100644
--- a/build2/lexer.cxx
+++ b/libbuild2/lexer.cxx
@@ -1,8 +1,8 @@
-// file      : build2/lexer.cxx -*- C++ -*-
+// file      : libbuild2/lexer.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/lexer.hxx>
+#include <libbuild2/lexer.hxx>
 
 #include <cstring> // strchr()
 
diff --git a/build2/lexer.hxx b/libbuild2/lexer.hxx
index b71167a..f987071 100644
--- a/build2/lexer.hxx
+++ b/libbuild2/lexer.hxx
@@ -1,19 +1,21 @@
-// file      : build2/lexer.hxx -*- C++ -*-
+// file      : libbuild2/lexer.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_LEXER_HXX
-#define BUILD2_LEXER_HXX
+#ifndef LIBBUILD2_LEXER_HXX
+#define LIBBUILD2_LEXER_HXX
 
 #include <stack>
 
 #include <libbutl/char-scanner.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/token.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/token.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -66,7 +68,7 @@ namespace build2
     lexer_mode (base_type v): base_type (v) {}
   };
 
-  class lexer: public butl::char_scanner
+  class LIBBUILD2_SYMEXPORT lexer: public butl::char_scanner
   {
   public:
     // If escape is not NULL then only escape sequences with characters from
@@ -202,4 +204,4 @@ namespace butl // ADL
   }
 }
 
-#endif // BUILD2_LEXER_HXX
+#endif // LIBBUILD2_LEXER_HXX
diff --git a/build2/lexer.test.cxx b/libbuild2/lexer.test.cxx
index 8abd5f7..84520d1 100644
--- a/build2/lexer.test.cxx
+++ b/libbuild2/lexer.test.cxx
@@ -1,15 +1,15 @@
-// file      : build2/lexer.test.cxx -*- C++ -*-
+// file      : libbuild2/lexer.test.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/token.hxx>
-#include <build2/lexer.hxx>
+#include <libbuild2/token.hxx>
+#include <libbuild2/lexer.hxx>
 
 using namespace std;
 
diff --git a/build2/module.cxx b/libbuild2/module.cxx
index a4a0341..50530f2 100644
--- a/build2/module.cxx
+++ b/libbuild2/module.cxx
@@ -1,12 +1,12 @@
-// file      : build2/module.cxx -*- C++ -*-
+// file      : libbuild2/module.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/module.hxx>
+#include <libbuild2/module.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/module.hxx b/libbuild2/module.hxx
index 610b14f..5fbed9c 100644
--- a/build2/module.hxx
+++ b/libbuild2/module.hxx
@@ -1,17 +1,19 @@
-// file      : build2/module.hxx -*- C++ -*-
+// file      : libbuild2/module.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_MODULE_HXX
-#define BUILD2_MODULE_HXX
+#ifndef LIBBUILD2_MODULE_HXX
+#define LIBBUILD2_MODULE_HXX
 
 #include <map>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -87,7 +89,7 @@ namespace build2
 
   // Load and boot the specified module.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   boot_module (scope& root, const string& name, const location&);
 
   // Load (if not already loaded) and initialize the specified module. Used
@@ -101,7 +103,7 @@ namespace build2
   // module (which may not always be able to extract the same information from
   // its tools).
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   load_module (scope& root,
                scope& base,
                const string& name,
@@ -112,7 +114,7 @@ namespace build2
   // Builtin modules.
   //
   using available_module_map = std::map<string, module_functions>;
-  extern available_module_map builtin_modules;
+  LIBBUILD2_SYMEXPORT extern available_module_map builtin_modules;
 }
 
-#endif // BUILD2_MODULE_HXX
+#endif // LIBBUILD2_MODULE_HXX
diff --git a/build2/name.cxx b/libbuild2/name.cxx
index 5aa7754..4aac32f 100644
--- a/build2/name.cxx
+++ b/libbuild2/name.cxx
@@ -1,12 +1,12 @@
-// file      : build2/name.cxx -*- C++ -*-
+// file      : libbuild2/name.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/types.hxx> // Note: not <build2/names>
+#include <libbuild2/types.hxx> // Note: not <libbuild2/name.hxx>
 
 #include <string.h> // strchr()
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 namespace build2
 {
diff --git a/build2/name.hxx b/libbuild2/name.hxx
index ba6b7a6..1ce073a 100644
--- a/build2/name.hxx
+++ b/libbuild2/name.hxx
@@ -1,17 +1,20 @@
-// file      : build2/name.hxx -*- C++ -*-
+// file      : libbuild2/name.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-// Note: include <build2/types.hxx> instead of this file directly.
+// Note: include <libbuild2/types.hxx> instead of this file directly.
 //
 
-#ifndef BUILD2_NAME_HXX
-#define BUILD2_NAME_HXX
+#ifndef LIBBUILD2_NAME_HXX
+#define LIBBUILD2_NAME_HXX
 
-// We cannot include <build2/utility.hxx> since it includes <build2/types>.
+// We cannot include <libbuild2/utility.hxx> since it includes
+// <libbuild2/types.hxx>.
 //
 #include <utility> // move()
 
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
   using std::move;
@@ -91,7 +94,7 @@ namespace build2
     compare (const name&) const;
   };
 
-  extern const name empty_name;
+  LIBBUILD2_SYMEXPORT extern const name empty_name;
 
   inline bool
   operator== (const name& x, const name& y) {return x.compare (y) == 0;}
@@ -104,7 +107,7 @@ namespace build2
 
   // Return string representation of a name.
   //
-  string
+  LIBBUILD2_SYMEXPORT string
   to_string (const name&);
 
   // Store a string in a name in a reversible way. If the string ends with a
@@ -129,7 +132,7 @@ namespace build2
   // Note that in the quoted mode empty unqualified name is printed as '',
   // not {}.
   //
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   to_stream (ostream&, const name&, bool quote, char pair = '\0');
 
   inline ostream&
@@ -145,11 +148,11 @@ namespace build2
   using names = small_vector<name, 1>;
   using names_view = vector_view<const name>;
 
-  extern const names empty_names;
+  LIBBUILD2_SYMEXPORT extern const names empty_names;
 
   // The same semantics as to_stream(name).
   //
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   to_stream (ostream&, const names_view&, bool quote, char pair = '\0');
 
   inline ostream&
@@ -164,6 +167,6 @@ namespace build2
   using name_pair = pair<name, name>;
 }
 
-#include <build2/name.ixx>
+#include <libbuild2/name.ixx>
 
-#endif // BUILD2_NAME_HXX
+#endif // LIBBUILD2_NAME_HXX
diff --git a/build2/name.ixx b/libbuild2/name.ixx
index 79b3145..188126e 100644
--- a/build2/name.ixx
+++ b/libbuild2/name.ixx
@@ -1,4 +1,4 @@
-// file      : build2/name.ixx -*- C++ -*-
+// file      : libbuild2/name.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/name.test.cxx b/libbuild2/name.test.cxx
index 0434aac..09fb841 100644
--- a/build2/name.test.cxx
+++ b/libbuild2/name.test.cxx
@@ -1,4 +1,4 @@
-// file      : build2/name.test.cxx -*- C++ -*-
+// file      : libbuild2/name.test.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
@@ -7,10 +7,10 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>   // Includes name.
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>   // Includes name.
+#include <libbuild2/utility.hxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/operation.cxx b/libbuild2/operation.cxx
index 0144e51..9d84cc2 100644
--- a/build2/operation.cxx
+++ b/libbuild2/operation.cxx
@@ -1,16 +1,16 @@
-// file      : build2/operation.cxx -*- C++ -*-
+// file      : libbuild2/operation.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/operation.hxx>
+#include <libbuild2/operation.hxx>
 
 #include <iostream> // cout
 
-#include <build2/file.hxx>
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/operation.hxx b/libbuild2/operation.hxx
index 03026eb..86f93c6 100644
--- a/build2/operation.hxx
+++ b/libbuild2/operation.hxx
@@ -1,19 +1,21 @@
-// file      : build2/operation.hxx -*- C++ -*-
+// file      : libbuild2/operation.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_OPERATION_HXX
-#define BUILD2_OPERATION_HXX
+#ifndef LIBBUILD2_OPERATION_HXX
+#define LIBBUILD2_OPERATION_HXX
 
 #include <libbutl/string-table.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
-#include <build2/variable.hxx>
-#include <build2/prerequisite.hxx>
-#include <build2/target-state.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/prerequisite.hxx>
+#include <libbuild2/target-state.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -152,7 +154,7 @@ namespace build2
   // loads the buildfile unless it has already been loaded for the root
   // scope.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   load (const values&,
         scope&,
         const path&,
@@ -163,7 +165,7 @@ namespace build2
   // Search and match the target. This is the default implementation
   // that does just that and adds a pointer to the target to the list.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   search (const values&,
           const scope&,
           const scope&,
@@ -172,7 +174,7 @@ namespace build2
           const location&,
           action_targets&);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   match (const values&, action, action_targets&,
          uint16_t diag, bool prog);
 
@@ -180,13 +182,13 @@ namespace build2
   // implementation that does just that while issuing appropriate
   // diagnostics (unless quiet).
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   execute (const values&, action, const action_targets&,
            uint16_t diag, bool prog);
 
-  extern const meta_operation_info mo_noop;
-  extern const meta_operation_info mo_perform;
-  extern const meta_operation_info mo_info;
+  LIBBUILD2_SYMEXPORT extern const meta_operation_info mo_noop;
+  LIBBUILD2_SYMEXPORT extern const meta_operation_info mo_perform;
+  LIBBUILD2_SYMEXPORT extern const meta_operation_info mo_info;
 
   // Operation info.
   //
@@ -236,9 +238,9 @@ namespace build2
 
   // Built-in operations.
   //
-  extern const operation_info op_default;
-  extern const operation_info op_update;
-  extern const operation_info op_clean;
+  LIBBUILD2_SYMEXPORT extern const operation_info op_default;
+  LIBBUILD2_SYMEXPORT extern const operation_info op_update;
+  LIBBUILD2_SYMEXPORT extern const operation_info op_clean;
 
   // Global meta/operation tables. Each registered meta/operation
   // is assigned an id which is used as an index in the per-project
@@ -293,9 +295,11 @@ namespace build2
     return os << d.name;
   }
 
-  extern butl::string_table<meta_operation_id,
-                            meta_operation_data> meta_operation_table;
-  extern butl::string_table<operation_id> operation_table;
+  LIBBUILD2_SYMEXPORT extern butl::string_table<meta_operation_id,
+                                                meta_operation_data>
+  meta_operation_table;
+
+  LIBBUILD2_SYMEXPORT extern butl::string_table<operation_id> operation_table;
 
   // These are "sparse" in the sense that we may have "holes" that
   // are represented as NULL pointers. Also, lookup out of bounds
@@ -354,4 +358,4 @@ namespace butl
   };
 }
 
-#endif // BUILD2_OPERATION_HXX
+#endif // LIBBUILD2_OPERATION_HXX
diff --git a/build2/parser.cxx b/libbuild2/parser.cxx
index 1542cf6..4e8ad23 100644
--- a/build2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -1,25 +1,25 @@
-// file      : build2/parser.cxx -*- C++ -*-
+// file      : libbuild2/parser.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/parser.hxx>
+#include <libbuild2/parser.hxx>
 
 #include <sstream>
 #include <iostream> // cout
 
 #include <libbutl/filesystem.mxx> // path_search(), path_match()
 
-#include <build2/dump.hxx>
-#include <build2/file.hxx>
-#include <build2/scope.hxx>
-#include <build2/module.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/function.hxx>
-#include <build2/variable.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
-#include <build2/prerequisite.hxx>
+#include <libbuild2/dump.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
+#include <libbuild2/prerequisite.hxx>
 
 using namespace std;
 
diff --git a/build2/parser.hxx b/libbuild2/parser.hxx
index b4b7093..658f266 100644
--- a/build2/parser.hxx
+++ b/libbuild2/parser.hxx
@@ -1,20 +1,22 @@
-// file      : build2/parser.hxx -*- C++ -*-
+// file      : libbuild2/parser.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_PARSER_HXX
-#define BUILD2_PARSER_HXX
+#ifndef LIBBUILD2_PARSER_HXX
+#define LIBBUILD2_PARSER_HXX
 
 #include <stack>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/spec.hxx>
-#include <build2/lexer.hxx>
-#include <build2/token.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/spec.hxx>
+#include <libbuild2/lexer.hxx>
+#include <libbuild2/token.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -22,7 +24,7 @@ namespace build2
   class target;
   class prerequisite;
 
-  class parser
+  class LIBBUILD2_SYMEXPORT parser
   {
   public:
     // If boot is true, then we are parsing bootstrap.build and modules
@@ -668,4 +670,4 @@ namespace build2
   };
 }
 
-#endif // BUILD2_PARSER_HXX
+#endif // LIBBUILD2_PARSER_HXX
diff --git a/build2/prerequisite.cxx b/libbuild2/prerequisite.cxx
index 2eee32b..7355323 100644
--- a/build2/prerequisite.cxx
+++ b/libbuild2/prerequisite.cxx
@@ -1,13 +1,13 @@
-// file      : build2/prerequisite.cxx -*- C++ -*-
+// file      : libbuild2/prerequisite.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/prerequisite.hxx>
+#include <libbuild2/prerequisite.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/prerequisite.hxx b/libbuild2/prerequisite.hxx
index 258033d..f79ce04 100644
--- a/build2/prerequisite.hxx
+++ b/libbuild2/prerequisite.hxx
@@ -1,17 +1,19 @@
-// file      : build2/prerequisite.hxx -*- C++ -*-
+// file      : libbuild2/prerequisite.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_PREREQUISITE_HXX
-#define BUILD2_PREREQUISITE_HXX
+#ifndef LIBBUILD2_PREREQUISITE_HXX
+#define LIBBUILD2_PREREQUISITE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
-#include <build2/variable.hxx>
-#include <build2/target-key.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/target-key.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -40,12 +42,12 @@ namespace build2
     bool is_a (const target_type& tt) const {return tk.is_a (tt);}
   };
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const prerequisite_key&);
 
   // Note that every data member except for the target is immutable (const).
   //
-  class prerequisite
+  class LIBBUILD2_SYMEXPORT prerequisite
   {
   public:
     using scope_type = build2::scope;
@@ -222,6 +224,6 @@ namespace build2
            const target* = nullptr);
 }
 
-#include <build2/prerequisite.ixx>
+#include <libbuild2/prerequisite.ixx>
 
-#endif // BUILD2_PREREQUISITE_HXX
+#endif // LIBBUILD2_PREREQUISITE_HXX
diff --git a/build2/prerequisite.ixx b/libbuild2/prerequisite.ixx
index 3874011..d62af49 100644
--- a/build2/prerequisite.ixx
+++ b/libbuild2/prerequisite.ixx
@@ -1,16 +1,19 @@
-// file      : build2/prerequisite.ixx -*- C++ -*-
+// file      : libbuild2/prerequisite.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
-  include_type
+  LIBBUILD2_SYMEXPORT include_type
   include_impl (action,
                 const target&,
                 const string&,
                 const prerequisite&,
                 const target*);
 
-  extern const variable* var_include; // context.cxx
+  LIBBUILD2_SYMEXPORT extern const variable* var_include; // context.cxx
 
   inline include_type
   include (action a, const target& t, const prerequisite& p, const target* m)
diff --git a/build2/rule-map.hxx b/libbuild2/rule-map.hxx
index 52e4b9f..26f80a8 100644
--- a/build2/rule-map.hxx
+++ b/libbuild2/rule-map.hxx
@@ -1,18 +1,18 @@
-// file      : build2/rule-map.hxx -*- C++ -*-
+// file      : libbuild2/rule-map.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_RULE_MAP_HXX
-#define BUILD2_RULE_MAP_HXX
+#ifndef LIBBUILD2_RULE_MAP_HXX
+#define LIBBUILD2_RULE_MAP_HXX
 
 #include <map>
 
 #include <libbutl/prefix-map.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
+#include <libbuild2/action.hxx>
 
 namespace build2
 {
@@ -120,4 +120,4 @@ namespace build2
   };
 }
 
-#endif // BUILD2_RULE_MAP_HXX
+#endif // LIBBUILD2_RULE_MAP_HXX
diff --git a/build2/rule.cxx b/libbuild2/rule.cxx
index a09e28b..0ade8a3 100644
--- a/build2/rule.cxx
+++ b/libbuild2/rule.cxx
@@ -1,15 +1,15 @@
-// file      : build2/rule.cxx -*- C++ -*-
+// file      : libbuild2/rule.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/rule.hxx>
+#include <libbuild2/rule.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/rule.hxx b/libbuild2/rule.hxx
index a9bc178..abd754e 100644
--- a/build2/rule.hxx
+++ b/libbuild2/rule.hxx
@@ -1,15 +1,17 @@
-// file      : build2/rule.hxx -*- C++ -*-
+// file      : libbuild2/rule.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_RULE_HXX
-#define BUILD2_RULE_HXX
+#ifndef LIBBUILD2_RULE_HXX
+#define LIBBUILD2_RULE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/action.hxx>
-#include <build2/target.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/target.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -32,7 +34,7 @@ namespace build2
   // Fallback rule that only matches if the file exists. It will also match
   // an mtime_target provided it has a set timestamp.
   //
-  class file_rule: public rule
+  class LIBBUILD2_SYMEXPORT file_rule: public rule
   {
   public:
     virtual bool
@@ -45,7 +47,7 @@ namespace build2
     static const file_rule instance;
   };
 
-  class alias_rule: public rule
+  class LIBBUILD2_SYMEXPORT alias_rule: public rule
   {
   public:
     virtual bool
@@ -61,7 +63,7 @@ namespace build2
   // Note that this rule ignores the dry_run flag; see mkdir() in filesystem
   // for the rationale.
   //
-  class fsdir_rule: public rule
+  class LIBBUILD2_SYMEXPORT fsdir_rule: public rule
   {
   public:
     virtual bool
@@ -88,7 +90,7 @@ namespace build2
 
   // Fallback rule that always matches and does nothing.
   //
-  class noop_rule: public rule
+  class LIBBUILD2_SYMEXPORT noop_rule: public rule
   {
   public:
     virtual bool
@@ -102,4 +104,4 @@ namespace build2
   };
 }
 
-#endif // BUILD2_RULE_HXX
+#endif // LIBBUILD2_RULE_HXX
diff --git a/build2/scheduler.cxx b/libbuild2/scheduler.cxx
index ad3a640..8ac2b97 100644
--- a/build2/scheduler.cxx
+++ b/libbuild2/scheduler.cxx
@@ -1,8 +1,8 @@
-// file      : build2/scheduler.cxx -*- C++ -*-
+// file      : libbuild2/scheduler.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scheduler.hxx>
+#include <libbuild2/scheduler.hxx>
 
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
 #  include <pthread.h>
@@ -22,12 +22,36 @@
 #include <cerrno>
 #include <exception> // std::terminate()
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
 namespace build2
 {
+  // TLS cache of thread's task queue.
+  //
+  // Note that scheduler::task_queue struct is private.
+  //
+  static
+#ifdef __cpp_thread_local
+  thread_local
+#else
+  __thread
+#endif
+  void* scheduler_queue = nullptr;
+
+  scheduler::task_queue* scheduler::
+  queue () noexcept
+  {
+    return static_cast<scheduler::task_queue*> (scheduler_queue);
+  }
+
+  void scheduler::
+  queue (scheduler::task_queue* q) noexcept
+  {
+    scheduler_queue = q;
+  }
+
   size_t scheduler::
   wait (size_t start_count, const atomic_count& task_count, work_queue wq)
   {
@@ -47,7 +71,7 @@ namespace build2
       // If we are waiting on someone else's task count then there migh still
       // be no queue (set by async()).
       //
-      if (task_queue* tq = task_queue_)
+      if (task_queue* tq = queue ())
       {
         for (lock ql (tq->mutex); !tq->shutdown && !empty_back (*tq); )
         {
@@ -571,12 +595,13 @@ namespace build2
     // MinGW   :   2048 / 2048
     // VC      :   1024 / 1024
     //
-    // Provided the main thread size is less-equal than BUILD2_SANE_STACK_SIZE
-    // (default: sizeof(void*) * BUILD2_DEFAULT_STACK_SIZE), we make sure that
-    // the new thread stack is the same as for the main thread. Otherwise, we
-    // cap it at BUILD2_DEFAULT_STACK_SIZE (default: 8MB). This can also be
-    // overridden at runtime with the --max-stack option (remember to update
-    // its documentation of changing anything here).
+    // Provided the main thread size is less-equal than
+    // LIBBUILD2_SANE_STACK_SIZE (which defaults to
+    // sizeof(void*)*LIBBUILD2_DEFAULT_STACK_SIZE), we make sure that the new
+    // thread stack is the same as for the main thread. Otherwise, we cap it
+    // at LIBBUILD2_DEFAULT_STACK_SIZE (default: 8MB). This can also be
+    // overridden at runtime with the --max-stack build2 driver option
+    // (remember to update its documentation of changing anything here).
     //
     // On Windows the stack size is the same for all threads and is customized
     // at the linking stage (see build2/buildfile). Thus neither *_STACK_SIZE
@@ -596,12 +621,12 @@ namespace build2
     //
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
 
-#ifndef BUILD2_DEFAULT_STACK_SIZE
-#  define BUILD2_DEFAULT_STACK_SIZE 8388608 // 8MB
+#ifndef LIBBUILD2_DEFAULT_STACK_SIZE
+#  define LIBBUILD2_DEFAULT_STACK_SIZE 8388608 // 8MB
 #endif
 
-#ifndef BUILD2_SANE_STACK_SIZE
-#  define BUILD2_SANE_STACK_SIZE (sizeof(void*) * BUILD2_DEFAULT_STACK_SIZE)
+#ifndef LIBBUILD2_SANE_STACK_SIZE
+#  define LIBBUILD2_SANE_STACK_SIZE (sizeof(void*) * LIBBUILD2_DEFAULT_STACK_SIZE)
 #endif
 
     // Auto-deleter.
@@ -671,8 +696,8 @@ namespace build2
       if (*max_stack_ != 0 && stack_size > *max_stack_)
         stack_size = *max_stack_;
     }
-    else if (stack_size > BUILD2_SANE_STACK_SIZE)
-      stack_size = BUILD2_DEFAULT_STACK_SIZE;
+    else if (stack_size > LIBBUILD2_SANE_STACK_SIZE)
+      stack_size = LIBBUILD2_DEFAULT_STACK_SIZE;
 
     pthread_attr_t attr;
     int r (pthread_attr_init (&attr));
@@ -775,13 +800,6 @@ namespace build2
     return nullptr;
   }
 
-#ifdef __cpp_thread_local
-    thread_local
-#else
-    __thread
-#endif
-  scheduler::task_queue* scheduler::task_queue_ = nullptr;
-
   auto scheduler::
   create_queue () -> task_queue&
   {
@@ -796,7 +814,7 @@ namespace build2
       tq->shutdown = shutdown_;
     }
 
-    task_queue_ = tq;
+    queue (tq);
     return *tq;
   }
 }
diff --git a/build2/scheduler.hxx b/libbuild2/scheduler.hxx
index 3aa1dc5..09c9e02 100644
--- a/build2/scheduler.hxx
+++ b/libbuild2/scheduler.hxx
@@ -1,9 +1,9 @@
-// file      : build2/scheduler.hxx -*- C++ -*-
+// file      : libbuild2/scheduler.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_SCHEDULER_HXX
-#define BUILD2_SCHEDULER_HXX
+#ifndef LIBBUILD2_SCHEDULER_HXX
+#define LIBBUILD2_SCHEDULER_HXX
 
 #include <list>
 #include <mutex>
@@ -12,8 +12,10 @@
 #include <type_traits>        // aligned_storage, etc
 #include <condition_variable>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -51,7 +53,7 @@ namespace build2
   // stack. All this means that the number of threads created by the scheduler
   // will normally exceed the maximum active allowed.
   //
-  class scheduler
+  class LIBBUILD2_SYMEXPORT scheduler
   {
   public:
     using atomic_count = std::atomic<size_t>;
@@ -289,7 +291,7 @@ namespace build2
     void
     join ()
     {
-      assert (task_queue_ = nullptr);
+      assert (queue () == nullptr);
 
       // Lock the mutex to make sure the values set in startup() are visible
       // in this thread.
@@ -306,7 +308,7 @@ namespace build2
     void
     leave ()
     {
-      task_queue_ = nullptr;
+      queue (nullptr);
     }
 
     // Return the number of hardware threads or 0 if unable to determine.
@@ -691,21 +693,17 @@ namespace build2
     //
     std::list<task_queue> task_queues_;
 
-    // TLS cache of thread's task queue.
-    //
-    static
-#ifdef __cpp_thread_local
-    thread_local
-#else
-    __thread
-#endif
-    task_queue* task_queue_;
-
     task_queue&
     create_queue ();
+
+    static task_queue*
+    queue () noexcept;
+
+    static void
+    queue (task_queue*) noexcept;
   };
 }
 
-#include <build2/scheduler.txx>
+#include <libbuild2/scheduler.txx>
 
-#endif // BUILD2_SCHEDULER_HXX
+#endif // LIBBUILD2_SCHEDULER_HXX
diff --git a/build2/scheduler.test.cxx b/libbuild2/scheduler.test.cxx
index b088c1d..1252575 100644
--- a/build2/scheduler.test.cxx
+++ b/libbuild2/scheduler.test.cxx
@@ -1,4 +1,4 @@
-// file      : build2/scheduler.test.cxx -*- C++ -*-
+// file      : libbuild2/scheduler.test.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
@@ -8,10 +8,10 @@
 #include <cassert>
 #include <iostream>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scheduler.hxx>
+#include <libbuild2/scheduler.hxx>
 
 using namespace std;
 
diff --git a/build2/scheduler.txx b/libbuild2/scheduler.txx
index 97eae62..805a072 100644
--- a/build2/scheduler.txx
+++ b/libbuild2/scheduler.txx
@@ -1,4 +1,4 @@
-// file      : build2/scheduler.txx -*- C++ -*-
+// file      : libbuild2/scheduler.txx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
@@ -45,7 +45,7 @@ namespace build2
     // Try to push the task into the queue falling back to running serially
     // if the queue is full.
     //
-    task_queue* tq (task_queue_); // Single load.
+    task_queue* tq (queue ()); // Single load.
     if (tq == nullptr)
       tq = &create_queue ();
 
diff --git a/build2/scope.cxx b/libbuild2/scope.cxx
index a6ebe1f..1ad7455 100644
--- a/build2/scope.cxx
+++ b/libbuild2/scope.cxx
@@ -1,11 +1,11 @@
-// file      : build2/scope.cxx -*- C++ -*-
+// file      : libbuild2/scope.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/scope.hxx>
+#include <libbuild2/scope.hxx>
 
-#include <build2/target.hxx>
-#include <build2/context.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
 
 using namespace std;
 
diff --git a/build2/scope.hxx b/libbuild2/scope.hxx
index afd294e..7b4fec5 100644
--- a/build2/scope.hxx
+++ b/libbuild2/scope.hxx
@@ -1,29 +1,31 @@
-// file      : build2/scope.hxx -*- C++ -*-
+// file      : libbuild2/scope.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_SCOPE_HXX
-#define BUILD2_SCOPE_HXX
+#ifndef LIBBUILD2_SCOPE_HXX
+#define LIBBUILD2_SCOPE_HXX
 
 #include <map>
 #include <unordered_set>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/module.hxx>
-#include <build2/variable.hxx>
-#include <build2/target-key.hxx>
-#include <build2/target-type.hxx>
-#include <build2/target-state.hxx>
-#include <build2/rule-map.hxx>
-#include <build2/operation.hxx>
+#include <libbuild2/module.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/target-key.hxx>
+#include <libbuild2/target-type.hxx>
+#include <libbuild2/target-state.hxx>
+#include <libbuild2/rule-map.hxx>
+#include <libbuild2/operation.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
   class dir;
 
-  class scope
+  class LIBBUILD2_SYMEXPORT scope
   {
   public:
     // Absolute and normalized.
@@ -347,10 +349,11 @@ namespace build2
     friend class scope_map;
     friend class temp_scope;
 
-    // These two from <build2/file.hxx> set strong_.
+    // These two from <libbuild2/file.hxx> set strong_.
     //
-    friend void create_bootstrap_outer (scope&);
-    friend scope& create_bootstrap_inner (scope&, const dir_path&);
+    friend LIBBUILD2_SYMEXPORT void create_bootstrap_outer (scope&);
+    friend LIBBUILD2_SYMEXPORT scope& create_bootstrap_inner (scope&,
+                                                              const dir_path&);
 
     explicit
     scope (bool global): vars (global), target_vars (global) {}
@@ -402,7 +405,7 @@ namespace build2
     // Note that we assume the first insertion into the map is always the
     // global scope with empty key.
     //
-    iterator
+    LIBBUILD2_SYMEXPORT iterator
     insert (const dir_path&, bool root = false);
 
     // Find the most qualified scope that encompasses this path.
@@ -443,24 +446,26 @@ namespace build2
     rw (scope&) const {return const_cast<scope_map&> (*this);}
 
   private:
-    static scope_map instance;
+    LIBBUILD2_SYMEXPORT static scope_map instance;
 
     // Entities that can access bypassing the lock proof.
     //
     friend int main (int, char*[]);
-    friend variable_overrides reset (const strings&);
+    friend LIBBUILD2_SYMEXPORT variable_overrides reset (const strings&);
 
-    scope&
+    LIBBUILD2_SYMEXPORT scope&
     find (const dir_path&);
 
   public:
-    static const scope_map& cinstance; // For var_pool initialization.
+    // For var_pool initialization.
+    //
+    LIBBUILD2_SYMEXPORT static const scope_map& cinstance;
   };
 
-  extern const scope_map& scopes;
-  extern const scope* global_scope;
+  LIBBUILD2_SYMEXPORT extern const scope_map& scopes;
+  LIBBUILD2_SYMEXPORT extern const scope* global_scope;
 }
 
-#include <build2/scope.ixx>
+#include <libbuild2/scope.ixx>
 
-#endif // BUILD2_SCOPE_HXX
+#endif // LIBBUILD2_SCOPE_HXX
diff --git a/build2/scope.ixx b/libbuild2/scope.ixx
index 171ab25..3498ae0 100644
--- a/build2/scope.ixx
+++ b/libbuild2/scope.ixx
@@ -1,4 +1,4 @@
-// file      : build2/scope.ixx -*- C++ -*-
+// file      : libbuild2/scope.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/search.cxx b/libbuild2/search.cxx
index 68fd5a5..1ff9c73 100644
--- a/build2/search.cxx
+++ b/libbuild2/search.cxx
@@ -1,15 +1,15 @@
-// file      : build2/search.cxx -*- C++ -*-
+// file      : libbuild2/search.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/search.hxx>
+#include <libbuild2/search.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/target.hxx>
-#include <build2/context.hxx>
-#include <build2/filesystem.hxx>   // mtime()
-#include <build2/prerequisite.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/filesystem.hxx>   // mtime()
+#include <libbuild2/prerequisite.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/search.hxx b/libbuild2/search.hxx
index 3e08bf8..b281b12 100644
--- a/build2/search.hxx
+++ b/libbuild2/search.hxx
@@ -1,12 +1,14 @@
-// file      : build2/search.hxx -*- C++ -*-
+// file      : libbuild2/search.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_SEARCH_HXX
-#define BUILD2_SEARCH_HXX
+#ifndef LIBBUILD2_SEARCH_HXX
+#define LIBBUILD2_SEARCH_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -15,7 +17,7 @@ namespace build2
 
   // Search for an existing target in this prerequisite's scope.
   //
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   search_existing_target (const prerequisite_key&);
 
   // Search for an existing file. If the prerequisite directory is relative,
@@ -27,13 +29,13 @@ namespace build2
   // Originally the plan was to have a target-type specific variable that
   // contains the search paths. But there wasn't any need for this yet.
   //
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   search_existing_file (const prerequisite_key&);
 
   // Create a new target in this prerequisite's scope.
   //
-  const target&
+  LIBBUILD2_SYMEXPORT const target&
   create_new_target (const prerequisite_key&);
 }
 
-#endif // BUILD2_SEARCH_HXX
+#endif // LIBBUILD2_SEARCH_HXX
diff --git a/build2/spec.cxx b/libbuild2/spec.cxx
index eb85c68..3ad6b7d 100644
--- a/build2/spec.cxx
+++ b/libbuild2/spec.cxx
@@ -1,11 +1,11 @@
-// file      : build2/spec.cxx -*- C++ -*-
+// file      : libbuild2/spec.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/spec.hxx>
+#include <libbuild2/spec.hxx>
 
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
diff --git a/build2/spec.hxx b/libbuild2/spec.hxx
index 9b429da..b18f665 100644
--- a/build2/spec.hxx
+++ b/libbuild2/spec.hxx
@@ -1,14 +1,16 @@
-// file      : build2/spec.hxx -*- C++ -*-
+// file      : libbuild2/spec.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_SPEC_HXX
-#define BUILD2_SPEC_HXX
+#ifndef LIBBUILD2_SPEC_HXX
+#define LIBBUILD2_SPEC_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/variable.hxx>
+#include <libbuild2/variable.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -54,17 +56,17 @@ namespace build2
 
   typedef vector<metaopspec> buildspec;
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const targetspec&);
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const opspec&);
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const metaopspec&);
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const buildspec&);
 }
 
-#endif // BUILD2_SPEC_HXX
+#endif // LIBBUILD2_SPEC_HXX
diff --git a/build2/target-key.hxx b/libbuild2/target-key.hxx
index ed9a0ed..e23991d 100644
--- a/build2/target-key.hxx
+++ b/libbuild2/target-key.hxx
@@ -1,19 +1,21 @@
-// file      : build2/target-key.hxx -*- C++ -*-
+// file      : libbuild2/target-key.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TARGET_KEY_HXX
-#define BUILD2_TARGET_KEY_HXX
+#ifndef LIBBUILD2_TARGET_KEY_HXX
+#define LIBBUILD2_TARGET_KEY_HXX
 
 #include <map>
 #include <cstring> // strcmp()
 
 #include <libbutl/utility.mxx> // compare_c_string
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target-type.hxx>
+#include <libbuild2/target-type.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -71,10 +73,10 @@ namespace build2
   // If the target type has a custom print function, call that. Otherwise,
   // call to_stream(). Both are defined in target.cxx.
   //
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const target_key&);
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   to_stream (ostream&, const target_key&, optional<stream_verbosity> = nullopt);
 }
 
@@ -101,4 +103,4 @@ namespace std
   };
 }
 
-#endif // BUILD2_TARGET_KEY_HXX
+#endif // LIBBUILD2_TARGET_KEY_HXX
diff --git a/build2/target-state.hxx b/libbuild2/target-state.hxx
index ff44edc..5bc6895 100644
--- a/build2/target-state.hxx
+++ b/libbuild2/target-state.hxx
@@ -1,12 +1,14 @@
-// file      : build2/target-state.hxx -*- C++ -*-
+// file      : libbuild2/target-state.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TARGET_STATE_HXX
-#define BUILD2_TARGET_STATE_HXX
+#ifndef LIBBUILD2_TARGET_STATE_HXX
+#define LIBBUILD2_TARGET_STATE_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -37,8 +39,8 @@ namespace build2
     return l;
   }
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, target_state); // target.cxx
 }
 
-#endif // BUILD2_TARGET_STATE_HXX
+#endif // LIBBUILD2_TARGET_STATE_HXX
diff --git a/build2/target-type.hxx b/libbuild2/target-type.hxx
index aec1bcf..3537c90 100644
--- a/build2/target-type.hxx
+++ b/libbuild2/target-type.hxx
@@ -1,14 +1,16 @@
-// file      : build2/target-type.hxx -*- C++ -*-
+// file      : libbuild2/target-type.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TARGET_TYPE_HXX
-#define BUILD2_TARGET_TYPE_HXX
+#ifndef LIBBUILD2_TARGET_TYPE_HXX
+#define LIBBUILD2_TARGET_TYPE_HXX
 
 #include <map>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -55,7 +57,7 @@ namespace build2
   // non-directory target must first call target::split_name() if reverse is
   // false.
   //
-  struct target_type
+  struct LIBBUILD2_SYMEXPORT target_type
   {
     const char* name;
     const target_type* base;
@@ -203,4 +205,4 @@ namespace build2
   };
 }
 
-#endif // BUILD2_TARGET_TYPE_HXX
+#endif // LIBBUILD2_TARGET_TYPE_HXX
diff --git a/build2/target.cxx b/libbuild2/target.cxx
index fee77b4..c823e85 100644
--- a/build2/target.cxx
+++ b/libbuild2/target.cxx
@@ -1,15 +1,15 @@
-// file      : build2/target.cxx -*- C++ -*-
+// file      : libbuild2/target.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/target.hxx>
+#include <libbuild2/target.hxx>
 
-#include <build2/file.hxx>
-#include <build2/scope.hxx>
-#include <build2/search.hxx>
-#include <build2/algorithm.hxx>
-#include <build2/filesystem.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/file.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/search.hxx>
+#include <libbuild2/algorithm.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
diff --git a/build2/target.hxx b/libbuild2/target.hxx
index b389ea5..cfbd9bc 100644
--- a/build2/target.hxx
+++ b/libbuild2/target.hxx
@@ -1,9 +1,9 @@
-// file      : build2/target.hxx -*- C++ -*-
+// file      : libbuild2/target.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TARGET_HXX
-#define BUILD2_TARGET_HXX
+#ifndef LIBBUILD2_TARGET_HXX
+#define LIBBUILD2_TARGET_HXX
 
 #include <iterator>     // tags, etc.
 #include <type_traits>  // aligned_storage
@@ -11,16 +11,18 @@
 
 #include <libbutl/multi-index.mxx> // map_iterator_adapter
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/scope.hxx>
-#include <build2/action.hxx>
-#include <build2/variable.hxx>
-#include <build2/target-key.hxx>
-#include <build2/target-type.hxx>
-#include <build2/target-state.hxx>
-#include <build2/prerequisite.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/action.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/target-key.hxx>
+#include <libbuild2/target-type.hxx>
+#include <libbuild2/target-state.hxx>
+#include <libbuild2/prerequisite.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -28,9 +30,11 @@ namespace build2
   class scope;
   class target;
 
-  extern size_t current_on; // From <build/context>.
+  // From <libbuild2/context.hxx>.
+  //
+  LIBBUILD2_SYMEXPORT extern size_t current_on;
 
-  // From <build2/algorithm.hxx>.
+  // From <libbuild2/algorithm.hxx>.
   //
   const target& search (const target&, const prerequisite&);
   const target* search_existing (const prerequisite&);
@@ -61,20 +65,24 @@ namespace build2
   // all the prerequisites in a loop, skipping ignored. Specifically,
   // for actions with the "first" execution mode, it calls
   // execute_prerequisites() while for those with the "last" mode --
-  // reverse_execute_prerequisites(); see <build2/operation.hxx>,
-  // <build2/algorithm.hxx> for details. The group recipe call's the group's
-  // recipe.
+  // reverse_execute_prerequisites(); see <libbuild2/operation.hxx>,
+  // <libbuild2/algorithm.hxx> for details. The group recipe call's the
+  // group's recipe.
   //
-  extern const recipe empty_recipe;
-  extern const recipe noop_recipe;
-  extern const recipe default_recipe;
-  extern const recipe group_recipe;
+  LIBBUILD2_SYMEXPORT extern const recipe empty_recipe;
+  LIBBUILD2_SYMEXPORT extern const recipe noop_recipe;
+  LIBBUILD2_SYMEXPORT extern const recipe default_recipe;
+  LIBBUILD2_SYMEXPORT extern const recipe group_recipe;
 
-  target_state
-  noop_action (action, const target&); // Defined in <build2/algorithm.hxx>.
+  // Defined in <libbuild2/algorithm.hxx>.
+  //
+  LIBBUILD2_SYMEXPORT target_state
+  noop_action (action, const target&);
 
-  target_state
-  group_action (action, const target&); // Defined in <build2/algorithm.hxx>.
+  // Defined in <libbuild2/algorithm.hxx>.
+  //
+  LIBBUILD2_SYMEXPORT target_state
+  group_action (action, const target&);
 
   // A view of target group members.
   //
@@ -114,7 +122,7 @@ namespace build2
 
   // Target.
   //
-  class target
+  class LIBBUILD2_SYMEXPORT target
   {
     optional<string>* ext_; // Reference to value in target_key.
 
@@ -337,17 +345,10 @@ namespace build2
     // be racy (see target::group).
     //
     bool
-    has_prerequisites () const
-    {
-      return !prerequisites ().empty ();
-    }
+    has_prerequisites () const;
 
     bool
-    has_group_prerequisites () const
-    {
-      return has_prerequisites () ||
-        (group != nullptr && !group->has_prerequisites ());
-    }
+    has_group_prerequisites () const;
 
   private:
     friend class parser;
@@ -470,7 +471,7 @@ namespace build2
 
     // Inner/outer operation state. See operation.hxx for details.
     //
-    class opstate
+    class LIBBUILD2_SYMEXPORT opstate
     {
     public:
       mutable atomic_count task_count {0}; // Start offset_touched - 1.
@@ -592,10 +593,7 @@ namespace build2
     // is known to be unchanged. Used for optimizations during search & match.
     //
     bool
-    unchanged (action a) const
-    {
-      return matched_state_impl (a).second == target_state::unchanged;
-    }
+    unchanged (action) const;
 
     // This function should only be called during execution if we have
     // observed (synchronization-wise) that this target has been executed.
@@ -783,8 +781,8 @@ namespace build2
   inline bool
   operator!= (const target& x, const target& y) {return !(x == y);}
 
-  inline ostream&
-  operator<< (ostream& os, const target& t) {return os << t.key ();}
+  ostream&
+  operator<< (ostream&, const target&);
 
   // Sometimes it is handy to "mark" a pointer to a target (for example, in
   // prerequisite_targets). We use the last 2 bits in a pointer for that (aka
@@ -822,19 +820,9 @@ namespace build2
   {
   public:
     explicit
-    group_prerequisites (const target& t)
-        : t_ (t),
-          g_ (t_.group == nullptr                 ||
-              t_.group->member != nullptr         || // Ad hoc group member.
-              t_.group->prerequisites ().empty ()
-              ? nullptr : t_.group) {}
+    group_prerequisites (const target& t);
 
-    explicit
-    group_prerequisites (const target& t, const target* g)
-        : t_ (t),
-          g_ (g == nullptr                 ||
-              g->prerequisites ().empty ()
-              ? nullptr : g) {}
+    group_prerequisites (const target& t, const target* g);
 
     using prerequisites_type = target::prerequisites_type;
     using base_iterator      = prerequisites_type::const_iterator;
@@ -854,31 +842,13 @@ namespace build2
                 base_iterator i): t_ (t), g_ (g), c_ (c), i_ (i) {}
 
       iterator&
-      operator++ ()
-      {
-        if (++i_ == c_->end () && c_ != &t_->prerequisites ())
-        {
-          c_ = &t_->prerequisites ();
-          i_ = c_->begin ();
-        }
-        return *this;
-      }
+      operator++ ();
 
       iterator
       operator++ (int) {iterator r (*this); operator++ (); return r;}
 
       iterator&
-      operator-- ()
-      {
-        if (i_ == c_->begin () && c_ == &t_->prerequisites ())
-        {
-          c_ = &g_->prerequisites ();
-          i_ = c_->end ();
-        }
-
-        --i_;
-        return *this;
-      }
+      operator-- ();
 
       iterator
       operator-- (int) {iterator r (*this); operator-- (); return r;}
@@ -905,18 +875,10 @@ namespace build2
     using reverse_iterator = std::reverse_iterator<iterator>;
 
     iterator
-    begin () const
-    {
-      auto& c ((g_ != nullptr ? *g_ : t_).prerequisites ());
-      return iterator (&t_, g_, &c, c.begin ());
-    }
+    begin () const;
 
     iterator
-    end () const
-    {
-      auto& c (t_.prerequisites ());
-      return iterator (&t_, g_, &c, c.end ());
-    }
+    end () const;
 
     reverse_iterator
     rbegin () const {return reverse_iterator (end ());}
@@ -925,11 +887,7 @@ namespace build2
     rend () const {return reverse_iterator (begin ());}
 
     size_t
-    size () const
-    {
-      return t_.prerequisites ().size () +
-        (g_ != nullptr ? g_->prerequisites ().size () : 0);
-    }
+    size () const;
 
   private:
     const target& t_;
@@ -968,12 +926,7 @@ namespace build2
     }
 
     prerequisite_key
-    key () const
-    {
-      return member != nullptr
-        ? prerequisite_key {prerequisite.proj, member->key (), nullptr}
-        : prerequisite.key ();
-    }
+    key () const;
 
     const target_type_type&
     type () const
@@ -1230,37 +1183,17 @@ namespace build2
     base_iterator e_;
   };
 
-  // prerequisite_members(t.prerequisites)
+  // prerequisite_members(t.prerequisites ())
   //
-  inline auto
-  prerequisite_members (action a, target& t,
-                        members_mode m = members_mode::always)
-  {
-    return prerequisite_members (a, t, t.prerequisites (), m);
-  }
-
-  inline auto
+  auto
   prerequisite_members (action a, const target& t,
-                        members_mode m = members_mode::always)
-  {
-    return prerequisite_members (a, t, t.prerequisites (), m);
-  }
+                        members_mode m = members_mode::always);
 
-  // prerequisite_members(reverse_iterate(t.prerequisites))
+  // prerequisite_members(reverse_iterate(t.prerequisites ()))
   //
-  inline auto
-  reverse_prerequisite_members (action a, target& t,
-                                members_mode m = members_mode::always)
-  {
-    return prerequisite_members (a, t, reverse_iterate (t.prerequisites ()), m);
-  }
-
-  inline auto
+  auto
   reverse_prerequisite_members (action a, const target& t,
-                                members_mode m = members_mode::always)
-  {
-    return prerequisite_members (a, t, reverse_iterate (t.prerequisites ()), m);
-  }
+                                members_mode m = members_mode::always);
 
   // prerequisite_members(group_prerequisites (t))
   //
@@ -1305,7 +1238,7 @@ namespace build2
   //
   // Note also that once the extension is specified, it becomes immutable.
   //
-  class target_set
+  class LIBBUILD2_SYMEXPORT target_set
   {
   public:
     using map_type = std::unordered_map<target_key, unique_ptr<target>>;
@@ -1450,11 +1383,11 @@ namespace build2
     map_type map_;
   };
 
-  extern target_set targets;
+  LIBBUILD2_SYMEXPORT extern target_set targets;
 
   // Modification time-based target.
   //
-  class mtime_target: public target
+  class LIBBUILD2_SYMEXPORT mtime_target: public target
   {
   public:
     using target::target;
@@ -1510,7 +1443,7 @@ namespace build2
     // Complain if timestamp is not lock-free unless we were told non-lock-
     // free is ok.
     //
-#ifndef BUILD2_ATOMIC_NON_LOCK_FREE
+#ifndef LIBBUILD2_ATOMIC_NON_LOCK_FREE
     // C++17:
     //
     // static_assert (atomic<timestamp::rep>::is_always_lock_free,
@@ -1533,7 +1466,7 @@ namespace build2
 
   // Filesystem path-based target.
   //
-  class path_target: public mtime_target
+  class LIBBUILD2_SYMEXPORT path_target: public mtime_target
   {
   public:
     using mtime_target::mtime_target;
@@ -1565,7 +1498,7 @@ namespace build2
     path (path_type) const;
 
     timestamp
-    load_mtime () const {return mtime_target::load_mtime (path ());}
+    load_mtime () const;
 
     // Derive a path from target's dir, name, and, if set, ext. If ext is not
     // set, try to derive it using the target type extension function and
@@ -1642,7 +1575,7 @@ namespace build2
 
   // File target.
   //
-  class file: public path_target
+  class LIBBUILD2_SYMEXPORT file: public path_target
   {
   public:
     using path_target::path_target;
@@ -1655,7 +1588,7 @@ namespace build2
   // Alias target. It represents a list of targets (its prerequisites)
   // as a single "name".
   //
-  class alias: public target
+  class LIBBUILD2_SYMEXPORT alias: public target
   {
   public:
     using target::target;
@@ -1669,7 +1602,7 @@ namespace build2
   // but rather an alias target with the directory name. For actual
   // filesystem directory (creation), see fsdir.
   //
-  class dir: public alias
+  class LIBBUILD2_SYMEXPORT dir: public alias
   {
   public:
     using alias::alias;
@@ -1702,7 +1635,7 @@ namespace build2
   // already exist. In particular, we don't want to update the target just
   // because some unrelated entry was created in that directory.
   //
-  class fsdir: public target
+  class LIBBUILD2_SYMEXPORT fsdir: public target
   {
   public:
     using target::target;
@@ -1714,7 +1647,7 @@ namespace build2
 
   // Executable file.
   //
-  class exe: public file
+  class LIBBUILD2_SYMEXPORT exe: public file
   {
   public:
     using file::file;
@@ -1724,7 +1657,7 @@ namespace build2
     virtual const target_type& dynamic_type () const {return static_type;}
   };
 
-  class buildfile: public file
+  class LIBBUILD2_SYMEXPORT buildfile: public file
   {
   public:
     using file::file;
@@ -1736,7 +1669,7 @@ namespace build2
 
   // Common documentation file targets.
   //
-  class doc: public file
+  class LIBBUILD2_SYMEXPORT doc: public file
   {
   public:
     using file::file;
@@ -1780,7 +1713,7 @@ namespace build2
   // Note that handling subsections with man1..9{} is easy, we
   // simply specify the extension explicitly, e.g., man{foo.1p}.
   //
-  class man: public doc
+  class LIBBUILD2_SYMEXPORT man: public doc
   {
   public:
     using doc::doc;
@@ -1790,7 +1723,7 @@ namespace build2
     virtual const target_type& dynamic_type () const {return static_type;}
   };
 
-  class man1: public man
+  class LIBBUILD2_SYMEXPORT man1: public man
   {
   public:
     using man::man;
@@ -1805,7 +1738,7 @@ namespace build2
   // If you think about it, it's kind of a documentation, similar to (but
   // better than) the version file that many projects come with.
   //
-  class manifest: public doc
+  class LIBBUILD2_SYMEXPORT manifest: public doc
   {
   public:
     using doc::doc;
@@ -1856,29 +1789,29 @@ namespace build2
   // Target type uses the extension but it is fixed and there is no use
   // printing it (e.g., man1{}).
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   target_print_0_ext_verb (ostream&, const target_key&);
 
   // Target type uses the extension and there is normally no default so it
   // should be printed (e.g., file{}).
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   target_print_1_ext_verb (ostream&, const target_key&);
 
   // The default behavior, that is, look for an existing target in the
   // prerequisite's directory scope.
   //
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   target_search (const target&, const prerequisite_key&);
 
   // First look for an existing target as above. If not found, then look
   // for an existing file in the target-type-specific list of paths.
   //
-  const target*
+  LIBBUILD2_SYMEXPORT const target*
   file_search (const target&, const prerequisite_key&);
 }
 
-#include <build2/target.ixx>
-#include <build2/target.txx>
+#include <libbuild2/target.ixx>
+#include <libbuild2/target.txx>
 
-#endif // BUILD2_TARGET_HXX
+#endif // LIBBUILD2_TARGET_HXX
diff --git a/build2/target.ixx b/libbuild2/target.ixx
index 30be02f..4570558 100644
--- a/build2/target.ixx
+++ b/libbuild2/target.ixx
@@ -1,10 +1,10 @@
-// file      : build2/target.ixx -*- C++ -*-
+// file      : libbuild2/target.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <cstring> // memcpy()
 
-#include <build2/filesystem.hxx> // mtime()
+#include <libbuild2/filesystem.hxx> // mtime()
 
 namespace build2
 {
@@ -64,6 +64,27 @@ namespace build2
     }
   }
 
+  inline bool target::
+  group_state (action a) const
+  {
+    // We go an extra step and short-circuit to the target state even if the
+    // raw state is not group provided the recipe is group_recipe and the
+    // state is unknown (see mtime() for a discussion on why we do it).
+    //
+    const opstate& s (state[a]);
+
+    if (s.state == target_state::group)
+      return true;
+
+    if (s.state == target_state::unknown && group != nullptr)
+    {
+      if (recipe_function* const* f = s.recipe.target<recipe_function*> ())
+        return *f == &group_action;
+    }
+
+    return false;
+  }
+
   inline pair<bool, target_state> target::
   matched_state_impl (action a) const
   {
@@ -93,27 +114,6 @@ namespace build2
     return (group_state (a) ? group->state : state)[a].state;
   }
 
-  inline bool target::
-  group_state (action a) const
-  {
-    // We go an extra step and short-circuit to the target state even if the
-    // raw state is not group provided the recipe is group_recipe and the
-    // state is unknown (see mtime() for a discussion on why we do it).
-    //
-    const opstate& s (state[a]);
-
-    if (s.state == target_state::group)
-      return true;
-
-    if (s.state == target_state::unknown && group != nullptr)
-    {
-      if (recipe_function* const* f = s.recipe.target<recipe_function*> ())
-        return *f == &group_action;
-    }
-
-    return false;
-  }
-
   inline target_state target::
   matched_state (action a, bool fail) const
   {
@@ -149,6 +149,31 @@ namespace build2
     return r;
   }
 
+  inline bool target::
+  has_prerequisites () const
+  {
+    return !prerequisites ().empty ();
+  }
+
+  inline bool target::
+  has_group_prerequisites () const
+  {
+    return has_prerequisites () ||
+      (group != nullptr && !group->has_prerequisites ());
+  }
+
+  inline bool target::
+  unchanged (action a) const
+  {
+    return matched_state_impl (a).second == target_state::unchanged;
+  }
+
+  inline ostream&
+  operator<< (ostream& os, const target& t)
+  {
+    return os << t.key ();
+  }
+
   // mark()/unmark()
   //
 
@@ -186,6 +211,75 @@ namespace build2
     return m;
   }
 
+  // group_prerequisites
+  //
+  inline group_prerequisites::
+  group_prerequisites (const target& t)
+      : t_ (t),
+        g_ (t_.group == nullptr                 ||
+            t_.group->member != nullptr         || // Ad hoc group member.
+            t_.group->prerequisites ().empty ()
+            ? nullptr : t_.group)
+  {
+  }
+
+  inline group_prerequisites::
+  group_prerequisites (const target& t, const target* g)
+      : t_ (t),
+        g_ (g == nullptr                 ||
+            g->prerequisites ().empty ()
+            ? nullptr : g)
+  {
+  }
+
+  inline auto group_prerequisites::
+  begin () const -> iterator
+  {
+    auto& c ((g_ != nullptr ? *g_ : t_).prerequisites ());
+    return iterator (&t_, g_, &c, c.begin ());
+  }
+
+  inline auto group_prerequisites::
+  end () const -> iterator
+  {
+    auto& c (t_.prerequisites ());
+    return iterator (&t_, g_, &c, c.end ());
+  }
+
+  inline size_t group_prerequisites::
+  size () const
+  {
+    return t_.prerequisites ().size () +
+      (g_ != nullptr ? g_->prerequisites ().size () : 0);
+  }
+
+  // group_prerequisites::iterator
+  //
+  inline auto group_prerequisites::iterator::
+  operator++ () -> iterator&
+  {
+    if (++i_ == c_->end () && c_ != &t_->prerequisites ())
+    {
+      c_ = &t_->prerequisites ();
+      i_ = c_->begin ();
+    }
+    return *this;
+  }
+
+
+  inline auto group_prerequisites::iterator::
+  operator-- () -> iterator&
+  {
+    if (i_ == c_->begin () && c_ == &t_->prerequisites ())
+    {
+      c_ = &g_->prerequisites ();
+      i_ = c_->end ();
+    }
+
+    --i_;
+    return *this;
+  }
+
   // prerequisite_member
   //
   inline prerequisite prerequisite_member::
@@ -202,6 +296,14 @@ namespace build2
     return prerequisite_type (*member);
   }
 
+  inline prerequisite_key prerequisite_member::
+  key () const
+  {
+    return member != nullptr
+      ? prerequisite_key {prerequisite.proj, member->key (), nullptr}
+      : prerequisite.key ();
+  }
+
   // prerequisite_members
   //
   group_view
@@ -297,6 +399,18 @@ namespace build2
       false;
   }
 
+  inline auto
+  prerequisite_members (action a, const target& t, members_mode m)
+  {
+    return prerequisite_members (a, t, t.prerequisites (), m);
+  }
+
+  inline auto
+  reverse_prerequisite_members (action a, const target& t, members_mode m)
+  {
+    return prerequisite_members (a, t, reverse_iterate (t.prerequisites ()), m);
+  }
+
   // mtime_target
   //
   inline void mtime_target::
@@ -373,4 +487,10 @@ namespace build2
 
     return path_;
   }
+
+  inline timestamp path_target::
+  load_mtime () const
+  {
+    return mtime_target::load_mtime (path ());
+  }
 }
diff --git a/build2/target.txx b/libbuild2/target.txx
index 3cc249b..b93a403 100644
--- a/build2/target.txx
+++ b/libbuild2/target.txx
@@ -1,12 +1,12 @@
-// file      : build2/target.txx -*- C++ -*-
+// file      : libbuild2/target.txx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <libbutl/filesystem.mxx> // dir_iterator
 
-#include <build2/scope.hxx>
-#include <build2/diagnostics.hxx>
-#include <build2/prerequisite.hxx>
+#include <libbuild2/scope.hxx>
+#include <libbuild2/diagnostics.hxx>
+#include <libbuild2/prerequisite.hxx>
 
 namespace build2
 {
diff --git a/build2/token.cxx b/libbuild2/token.cxx
index 8b62b46..7455e26 100644
--- a/build2/token.cxx
+++ b/libbuild2/token.cxx
@@ -1,8 +1,8 @@
-// file      : build2/token.cxx -*- C++ -*-
+// file      : libbuild2/token.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/token.hxx>
+#include <libbuild2/token.hxx>
 
 using namespace std;
 
diff --git a/build2/token.hxx b/libbuild2/token.hxx
index 50d1396..a9b9a11 100644
--- a/build2/token.hxx
+++ b/libbuild2/token.hxx
@@ -1,14 +1,16 @@
-// file      : build2/token.hxx -*- C++ -*-
+// file      : libbuild2/token.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TOKEN_HXX
-#define BUILD2_TOKEN_HXX
+#ifndef LIBBUILD2_TOKEN_HXX
+#define LIBBUILD2_TOKEN_HXX
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -78,7 +80,7 @@ namespace build2
 
   class token;
 
-  void
+  LIBBUILD2_SYMEXPORT void
   token_printer (ostream&, const token&, bool);
 
   class token
@@ -186,4 +188,4 @@ namespace build2
   }
 }
 
-#endif // BUILD2_TOKEN_HXX
+#endif // LIBBUILD2_TOKEN_HXX
diff --git a/build2/types.hxx b/libbuild2/types.hxx
index 15b7df6..cbaf89a 100644
--- a/build2/types.hxx
+++ b/libbuild2/types.hxx
@@ -1,16 +1,16 @@
-// file      : build2/types.hxx -*- C++ -*-
+// file      : libbuild2/types.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_TYPES_HXX
-#define BUILD2_TYPES_HXX
+#ifndef LIBBUILD2_TYPES_HXX
+#define LIBBUILD2_TYPES_HXX
 
 // Include unprocessed file during bootstrap. See config.hxx.in for details.
 //
 #ifdef BUILD2_BOOTSTRAP
-#  include <build2/config.hxx.in>
+#  include <libbuild2/config.hxx.in>
 #else
-#  include <build2/config.hxx>
+#  include <libbuild2/config.hxx>
 #endif
 
 #include <array>
@@ -56,6 +56,8 @@
 #include <libbutl/semantic-version.mxx>
 #include <libbutl/standard-version.mxx>
 
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
   // Commonly-used types.
@@ -328,10 +330,10 @@ namespace build2
   //
   enum class run_phase {load, match, execute};
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, run_phase); // utility.cxx
 
-  extern run_phase phase;
+  LIBBUILD2_SYMEXPORT extern run_phase phase;
 }
 
 // In order to be found (via ADL) these have to be either in std:: or in
@@ -342,17 +344,17 @@ namespace std
 {
   // Path printing with trailing slash for directories.
   //
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const ::butl::path&);
 
   // Print as recall[@effect].
   //
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, const ::butl::process_path&);
 }
 
-// <build2/name.hxx>
+// <libbuild2/name.hxx>
 //
-#include <build2/name.hxx>
+#include <libbuild2/name.hxx>
 
-#endif // BUILD2_TYPES_HXX
+#endif // LIBBUILD2_TYPES_HXX
diff --git a/build2/utility.cxx b/libbuild2/utility.cxx
index 9448c03..396ce82 100644
--- a/build2/utility.cxx
+++ b/libbuild2/utility.cxx
@@ -1,23 +1,23 @@
-// file      : build2/utility.cxx -*- C++ -*-
+// file      : libbuild2/utility.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/utility.hxx>
+#include <libbuild2/utility.hxx>
 
 #include <time.h>   // tzset() (POSIX), _tzset() (Windows)
 
 #include <cstring>  // strlen(), str[n]cmp()
 #include <iostream> // cerr
 
-#include <build2/target.hxx>
-#include <build2/variable.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 using namespace butl;
 
 //
-// <build2/types.hxx>
+// <libbuild2/types.hxx>
 //
 namespace build2
 {
@@ -67,11 +67,11 @@ namespace std
 namespace build2
 {
   //
-  // <build2/utility.hxx>
+  // <libbuild2/utility.hxx>
   //
   process_path argv0;
 
-  const standard_version build_version (BUILD2_VERSION_STR);
+  const standard_version build_version (LIBBUILD2_VERSION_STR);
 
   bool dry_run_option;
   optional<bool> mtime_check_option;
diff --git a/build2/utility.hxx b/libbuild2/utility.hxx
index 0aa5537..af72c58 100644
--- a/build2/utility.hxx
+++ b/libbuild2/utility.hxx
@@ -1,9 +1,9 @@
-// file      : build2/utility.hxx -*- C++ -*-
+// file      : libbuild2/utility.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_UTILITY_HXX
-#define BUILD2_UTILITY_HXX
+#ifndef LIBBUILD2_UTILITY_HXX
+#define LIBBUILD2_UTILITY_HXX
 
 #include <tuple>      // make_tuple()
 #include <memory>     // make_shared()
@@ -20,20 +20,22 @@
 
 #include <unordered_set>
 
-#include <build2/types.hxx>
+#include <libbuild2/types.hxx>
 
 // "Fake" version values used during bootstrap.
 //
 #ifdef BUILD2_BOOTSTRAP
-#  define BUILD2_VERSION      9999999999999990000ULL
-#  define BUILD2_VERSION_STR  "99999.99999.99999"
-#  define BUILD2_VERSION_ID   "99999.99999.99999"
-#  define LIBBUTL_VERSION_STR "99999.99999.99999"
-#  define LIBBUTL_VERSION_ID  "99999.99999.99999"
+#  define LIBBUILD2_VERSION     9999999999999990000ULL
+#  define LIBBUILD2_VERSION_STR "99999.99999.99999"
+#  define LIBBUILD2_VERSION_ID  "99999.99999.99999"
+#  define LIBBUTL_VERSION_STR   "99999.99999.99999"
+#  define LIBBUTL_VERSION_ID    "99999.99999.99999"
 #else
-#  include <build2/version.hxx>
+#  include <libbuild2/version.hxx>
 #endif
 
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
   using std::move;
@@ -92,29 +94,31 @@ namespace build2
   // Initialize the diagnostics state. Should be called once early in main().
   // Default values are for unit tests.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   init_diag (uint16_t verbosity,
              optional<bool> progress = nullopt,
              bool no_lines = false,
              bool no_columns = false,
              bool stderr_term = false);
 
-  extern uint16_t verb;
-  const  uint16_t verb_never = 7;
+  LIBBUILD2_SYMEXPORT extern uint16_t verb;
+  const uint16_t verb_never = 7;
 
-  extern optional<bool> diag_progress_option; // --[no-]progress
+  // --[no-]progress
+  //
+  LIBBUILD2_SYMEXPORT extern optional<bool> diag_progress_option;
 
-  extern bool diag_no_line;   // --no-line
-  extern bool diag_no_column; // --no-column
+  LIBBUILD2_SYMEXPORT extern bool diag_no_line;   // --no-line
+  LIBBUILD2_SYMEXPORT extern bool diag_no_column; // --no-column
 
-  extern bool stderr_term; // True if stderr is a terminal.
+  LIBBUILD2_SYMEXPORT extern bool stderr_term; // True if stderr is a terminal.
 
   // Global state (verbosity, home/work directories, etc).
 
   // Initialize the global state. Should be called once early in main().
   // Default values are for unit tests.
   //
-  void
+  LIBBUILD2_SYMEXPORT void
   init (const char* argv0,
         bool keep_going = false,
         bool dry_run = false,
@@ -124,35 +128,38 @@ namespace build2
 
   // Build system driver process path (argv0.initial is argv[0]).
   //
-  extern process_path argv0;
+  LIBBUILD2_SYMEXPORT extern process_path argv0;
 
   // Build system driver version and check.
   //
-  extern const standard_version build_version;
+  LIBBUILD2_SYMEXPORT extern const standard_version build_version;
+
+  LIBBUILD2_SYMEXPORT extern bool dry_run_option; // --dry-run
 
-  extern bool dry_run_option;               // --dry-run
-  extern optional<bool> mtime_check_option; // --[no-]mtime-check
+  // --[no-]mtime-check
+  //
+  LIBBUILD2_SYMEXPORT extern optional<bool> mtime_check_option;
 
-  extern optional<path> config_sub;   // --config-sub
-  extern optional<path> config_guess; // --config-guess
+  LIBBUILD2_SYMEXPORT extern optional<path> config_sub;   // --config-sub
+  LIBBUILD2_SYMEXPORT extern optional<path> config_guess; // --config-guess
 
   class location;
 
-  void
+  LIBBUILD2_SYMEXPORT void
   check_build_version (const standard_version_constraint&, const location&);
 
   // Work/home directories (must be initialized in main()) and relative path
   // calculation.
   //
-  extern dir_path work;
-  extern dir_path home;
+  LIBBUILD2_SYMEXPORT extern dir_path work;
+  LIBBUILD2_SYMEXPORT extern dir_path home;
 
   // By default this points to work. Setting this to something else should
   // only be done in tightly controlled, non-concurrent situations (e.g.,
   // state dump). If it is empty, then relative() below returns the original
   // path.
   //
-  extern const dir_path* relative_base;
+  LIBBUILD2_SYMEXPORT extern const dir_path* relative_base;
 
   // If possible and beneficial, translate an absolute, normalized path into
   // relative to the relative_base directory, which is normally work. Note
@@ -165,7 +172,7 @@ namespace build2
 
   class path_target;
 
-  path
+  LIBBUILD2_SYMEXPORT path
   relative (const path_target&);
 
   // In addition to calling relative(), this function also uses shorter
@@ -173,7 +180,7 @@ namespace build2
   // slash. If the path is the same as base, returns "./" if current is true
   // and empty string otherwise.
   //
-  string
+  LIBBUILD2_SYMEXPORT string
   diag_relative (const path&, bool current = true);
 
   // Basic process utilities.
@@ -184,7 +191,7 @@ namespace build2
   // Search for a process executable. Issue diagnostics and throw failed in
   // case of an error.
   //
-  process_path
+  LIBBUILD2_SYMEXPORT process_path
   run_search (const char*& args0,
               bool path_only,
               const location& = location ());
@@ -195,14 +202,14 @@ namespace build2
     return run_search (args0, false, l);
   }
 
-  process_path
+  LIBBUILD2_SYMEXPORT process_path
   run_search (const path&,
               bool init = false,
               const dir_path& fallback = dir_path (),
               bool path_only = false,
               const location& = location ());
 
-  process_path
+  LIBBUILD2_SYMEXPORT process_path
   try_run_search (const path&,
                   bool init = false,
                   const dir_path& fallback = dir_path (),
@@ -215,7 +222,7 @@ namespace build2
   // false), return false. The last argument is used in cooperation with
   // run_start() in case STDERR is redirected to STDOUT.
   //
-  bool
+  LIBBUILD2_SYMEXPORT bool
   run_finish (const char* args[],
               process&,
               bool error = true,
@@ -235,7 +242,7 @@ namespace build2
   // from the child process). Issue diagnostics and throw failed in case of an
   // error.
   //
-  process
+  LIBBUILD2_SYMEXPORT process
   run_start (uint16_t verbosity,
              const process_env&, // Implicit-constructible from process_path.
              const char* args[],
@@ -442,15 +449,15 @@ namespace build2
 
   // Empty/nullopt string, path, and project name.
   //
-  extern const string       empty_string;
-  extern const path         empty_path;
-  extern const dir_path     empty_dir_path;
-  extern const project_name empty_project_name;
+  LIBBUILD2_SYMEXPORT extern const string       empty_string;
+  LIBBUILD2_SYMEXPORT extern const path         empty_path;
+  LIBBUILD2_SYMEXPORT extern const dir_path     empty_dir_path;
+  LIBBUILD2_SYMEXPORT extern const project_name empty_project_name;
 
-  extern const optional<string>       nullopt_string;
-  extern const optional<path>         nullopt_path;
-  extern const optional<dir_path>     nullopt_dir_path;
-  extern const optional<project_name> nullopt_project_name;
+  LIBBUILD2_SYMEXPORT extern const optional<string>       nullopt_string;
+  LIBBUILD2_SYMEXPORT extern const optional<path>         nullopt_path;
+  LIBBUILD2_SYMEXPORT extern const optional<dir_path>     nullopt_dir_path;
+  LIBBUILD2_SYMEXPORT extern const optional<project_name> nullopt_project_name;
 
   // Hash a path potentially without the specific directory prefix.
   //
@@ -502,13 +509,13 @@ namespace build2
   class value;
   struct lookup;
 
-  void
+  LIBBUILD2_SYMEXPORT void
   append_options (cstrings&, const lookup&, const char* excl = nullptr);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   append_options (strings&, const lookup&, const char* excl = nullptr);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   hash_options (sha256&, const lookup&);
 
   void
@@ -520,17 +527,17 @@ namespace build2
   void
   hash_options (sha256&, const strings&);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   append_options (cstrings&,
                   const strings&, size_t,
                   const char* excl = nullptr);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   append_options (strings&,
                   const strings&, size_t,
                   const char* excl = nullptr);
 
-  void
+  LIBBUILD2_SYMEXPORT void
   hash_options (sha256&, const strings&, size_t);
 
   // As above but append/hash option values for the specified option (e.g.,
@@ -567,13 +574,13 @@ namespace build2
                const char* variable,
                bool ignore_case = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_option (const char* option, const lookup&, bool ignore_case = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_option (const char* option, const strings&, bool ignore_case = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_option (const char* option, const cstrings&, bool ignore_case = false);
 
   // As above but look for several options returning true if any is present.
@@ -589,13 +596,13 @@ namespace build2
   bool
   find_options (initializer_list<const char*>, T&, const char*, bool = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_options (initializer_list<const char*>, const lookup&, bool = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_options (initializer_list<const char*>, const strings&, bool = false);
 
-  bool
+  LIBBUILD2_SYMEXPORT bool
   find_options (initializer_list<const char*>, const cstrings&, bool = false);
 
   // As above but look for an option that has the specified prefix. Return the
@@ -611,13 +618,13 @@ namespace build2
   const string*
   find_option_prefix (const char* prefix, T&, const char*, bool = false);
 
-  const string*
+  LIBBUILD2_SYMEXPORT const string*
   find_option_prefix (const char* prefix, const lookup&, bool = false);
 
-  const string*
+  LIBBUILD2_SYMEXPORT const string*
   find_option_prefix (const char* prefix, const strings&, bool = false);
 
-  const char*
+  LIBBUILD2_SYMEXPORT const char*
   find_option_prefix (const char* prefix, const cstrings&, bool = false);
 
   // As above but look for several option prefixes.
@@ -636,16 +643,16 @@ namespace build2
                         const char*,
                         bool = false);
 
-  const string*
+  LIBBUILD2_SYMEXPORT const string*
   find_option_prefixes (initializer_list<const char*>,
                         const lookup&, bool = false);
 
-  const string*
+  LIBBUILD2_SYMEXPORT const string*
   find_option_prefixes (initializer_list<const char*>,
                         const strings&,
                         bool = false);
 
-  const char*
+  LIBBUILD2_SYMEXPORT const char*
   find_option_prefixes (initializer_list<const char*>,
                         const cstrings&,
                         bool = false);
@@ -654,11 +661,11 @@ namespace build2
   // NULL or empty, then return the stem itself. Assume the pattern is valid,
   // i.e., contains a single '*' character.
   //
-  string
+  LIBBUILD2_SYMEXPORT string
   apply_pattern (const char* stem, const string* pattern);
 }
 
-#include <build2/utility.ixx>
-#include <build2/utility.txx>
+#include <libbuild2/utility.ixx>
+#include <libbuild2/utility.txx>
 
-#endif // BUILD2_UTILITY_HXX
+#endif // LIBBUILD2_UTILITY_HXX
diff --git a/build2/utility.ixx b/libbuild2/utility.ixx
index 1b1fe79..8d3f6ba 100644
--- a/build2/utility.ixx
+++ b/libbuild2/utility.ixx
@@ -1,4 +1,4 @@
-// file      : build2/utility.ixx -*- C++ -*-
+// file      : libbuild2/utility.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/utility.txx b/libbuild2/utility.txx
index 0bbdfad..a91cb15 100644
--- a/build2/utility.txx
+++ b/libbuild2/utility.txx
@@ -1,4 +1,4 @@
-// file      : build2/utility.txx -*- C++ -*-
+// file      : libbuild2/utility.txx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
diff --git a/build2/variable.cxx b/libbuild2/variable.cxx
index 173efe5..beb169e 100644
--- a/build2/variable.cxx
+++ b/libbuild2/variable.cxx
@@ -1,15 +1,15 @@
-// file      : build2/variable.cxx -*- C++ -*-
+// file      : libbuild2/variable.cxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/variable.hxx>
+#include <libbuild2/variable.hxx>
 
 #include <cstring> // memcmp()
 
 #include <libbutl/filesystem.mxx> // path_match()
 
-#include <build2/context.hxx>
-#include <build2/diagnostics.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 using namespace std;
 
@@ -1519,4 +1519,15 @@ namespace build2
 
   size_t variable_cache_mutex_shard_size;
   unique_ptr<shared_mutex[]> variable_cache_mutex_shard;
+
+  template struct LIBBUILD2_DEFEXPORT value_traits<strings>;
+  template struct LIBBUILD2_DEFEXPORT value_traits<vector<name>>;
+  template struct LIBBUILD2_DEFEXPORT value_traits<paths>;
+  template struct LIBBUILD2_DEFEXPORT value_traits<dir_paths>;
+  template struct LIBBUILD2_DEFEXPORT value_traits<uint64s>;
+
+  template struct LIBBUILD2_DEFEXPORT value_traits<std::map<string, string>>;
+
+  template struct LIBBUILD2_DEFEXPORT
+  value_traits<std::map<project_name, dir_path>>;
 }
diff --git a/build2/variable.hxx b/libbuild2/variable.hxx
index 782cc2b..9a106b5 100644
--- a/build2/variable.hxx
+++ b/libbuild2/variable.hxx
@@ -1,9 +1,9 @@
-// file      : build2/variable.hxx -*- C++ -*-
+// file      : libbuild2/variable.hxx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_VARIABLE_HXX
-#define BUILD2_VARIABLE_HXX
+#ifndef LIBBUILD2_VARIABLE_HXX
+#define LIBBUILD2_VARIABLE_HXX
 
 #include <map>
 #include <set>
@@ -13,10 +13,12 @@
 #include <libbutl/prefix-map.mxx>
 #include <libbutl/multi-index.mxx> // map_key
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/target-type.hxx>
+#include <libbuild2/target-type.hxx>
+
+#include <libbuild2/export.hxx>
 
 namespace build2
 {
@@ -137,7 +139,7 @@ namespace build2
   }
 #endif
 
-  ostream&
+  LIBBUILD2_SYMEXPORT ostream&
   operator<< (ostream&, variable_visibility);
 
   // variable
@@ -253,7 +255,7 @@ namespace build2
 
   //
   //
-  class value
+  class LIBBUILD2_SYMEXPORT value
   {
   public:
     // NULL means this value is not (yet) typed.
@@ -397,12 +399,12 @@ namespace build2
   // values can also be untyped. NULL values compare equal and a NULL value
   // is always less than a non-NULL.
   //
-  bool operator== (const value&, const value&);
-  bool operator!= (const value&, const value&);
-  bool operator<  (const value&, const value&);
-  bool operator<= (const value&, const value&);
-  bool operator>  (const value&, const value&);
-  bool operator>= (const value&, const value&);
+  LIBBUILD2_SYMEXPORT bool operator== (const value&, const value&);
+                      bool operator!= (const value&, const value&);
+  LIBBUILD2_SYMEXPORT bool operator<  (const value&, const value&);
+                      bool operator<= (const value&, const value&);
+  LIBBUILD2_SYMEXPORT bool operator>  (const value&, const value&);
+                      bool operator>= (const value&, const value&);
 
   // Value cast. The first three expect the value to be not NULL. The cast
   // from lookup expects the value to also be defined.
@@ -455,12 +457,14 @@ namespace build2
   template <typename T>
   void typify        (value&, const variable*);
   void typify        (value&, const value_type&, const variable*);
-  void typify_atomic (value&, const value_type&, const variable*);
+
+  LIBBUILD2_SYMEXPORT void
+  typify_atomic (value&, const value_type&, const variable*);
 
   // Remove value type from the value reversing it to names. This is similar
   // to reverse() below except that it modifies the value itself.
   //
-  void untypify (value&);
+  LIBBUILD2_SYMEXPORT void untypify (value&);
 
   // Reverse the value back to names. The value should not be NULL and storage
   // should be empty.
@@ -678,7 +682,7 @@ namespace build2
   // names
   //
   template <>
-  struct value_traits<names>
+  struct LIBBUILD2_SYMEXPORT value_traits<names>
   {
     static const names& empty_instance;
   };
@@ -686,7 +690,7 @@ namespace build2
   // bool
   //
   template <>
-  struct value_traits<bool>
+  struct LIBBUILD2_SYMEXPORT value_traits<bool>
   {
     static_assert (sizeof (bool) <= value::size_, "insufficient space");
 
@@ -703,7 +707,7 @@ namespace build2
   };
 
   template <>
-  struct value_traits<uint64_t>
+  struct LIBBUILD2_SYMEXPORT value_traits<uint64_t>
   {
     static_assert (sizeof (uint64_t) <= value::size_, "insufficient space");
 
@@ -732,7 +736,7 @@ namespace build2
   // string
   //
   template <>
-  struct value_traits<string>
+  struct LIBBUILD2_SYMEXPORT value_traits<string>
   {
     static_assert (sizeof (string) <= value::size_, "insufficient space");
 
@@ -758,7 +762,7 @@ namespace build2
   // path
   //
   template <>
-  struct value_traits<path>
+  struct LIBBUILD2_SYMEXPORT value_traits<path>
   {
     static_assert (sizeof (path) <= value::size_, "insufficient space");
 
@@ -783,7 +787,7 @@ namespace build2
   // dir_path
   //
   template <>
-  struct value_traits<dir_path>
+  struct LIBBUILD2_SYMEXPORT value_traits<dir_path>
   {
     static_assert (sizeof (dir_path) <= value::size_, "insufficient space");
 
@@ -804,7 +808,7 @@ namespace build2
   // abs_dir_path
   //
   template <>
-  struct value_traits<abs_dir_path>
+  struct LIBBUILD2_SYMEXPORT value_traits<abs_dir_path>
   {
     static_assert (sizeof (abs_dir_path) <= value::size_,
                    "insufficient space");
@@ -824,7 +828,7 @@ namespace build2
   // name
   //
   template <>
-  struct value_traits<name>
+  struct LIBBUILD2_SYMEXPORT value_traits<name>
   {
     static_assert (sizeof (name) <= value::size_, "insufficient space");
 
@@ -847,7 +851,7 @@ namespace build2
   // pair of two empties).
   //
   template <>
-  struct value_traits<name_pair>
+  struct LIBBUILD2_SYMEXPORT value_traits<name_pair>
   {
     static_assert (sizeof (name_pair) <= value::size_, "insufficient space");
 
@@ -868,7 +872,7 @@ namespace build2
   // initial is its shallow copy.
   //
   template <>
-  struct value_traits<process_path>
+  struct LIBBUILD2_SYMEXPORT value_traits<process_path>
   {
     static_assert (sizeof (process_path) <= value::size_,
                    "insufficient space");
@@ -889,7 +893,7 @@ namespace build2
   // target_triplet
   //
   template <>
-  struct value_traits<target_triplet>
+  struct LIBBUILD2_SYMEXPORT value_traits<target_triplet>
   {
     static_assert (sizeof (target_triplet) <= value::size_,
                    "insufficient space");
@@ -909,7 +913,7 @@ namespace build2
   // project_name
   //
   template <>
-  struct value_traits<project_name>
+  struct LIBBUILD2_SYMEXPORT value_traits<project_name>
   {
     static_assert (sizeof (project_name) <= value::size_,
                    "insufficient space");
@@ -981,6 +985,24 @@ namespace build2
     static const value_type_ex value_type;
   };
 
+  // Explicitly pre-instantiate and export value_traits templates for
+  // vector/map value types used in the build2 project. Note that this is not
+  // merely an optimization since not doing so we may end up with multiple
+  // value type objects for the same traits type (and we use their addressed
+  // as identity; see cast(const value&) for an example).
+  //
+  extern template struct LIBBUILD2_DECEXPORT value_traits<strings>;
+  extern template struct LIBBUILD2_DECEXPORT value_traits<vector<name>>;
+  extern template struct LIBBUILD2_DECEXPORT value_traits<paths>;
+  extern template struct LIBBUILD2_DECEXPORT value_traits<dir_paths>;
+  extern template struct LIBBUILD2_DECEXPORT value_traits<uint64s>;
+
+  extern template struct LIBBUILD2_DECEXPORT
+  value_traits<std::map<string, string>>;
+
+  extern template struct LIBBUILD2_DECEXPORT
+  value_traits<std::map<project_name, dir_path>>;
+
   // Project-wide (as opposed to global) variable overrides. Returned by
   // context.cxx:reset().
   //
@@ -1085,7 +1107,7 @@ namespace build2
     // names (i.e., there would be no cross-alias overriding). So for now we
     // don't allow this (use the common variable mechanism instead).
     //
-    const variable&
+    LIBBUILD2_SYMEXPORT const variable&
     insert_alias (const variable& var, string name);
 
     // Insert a variable pattern. Any variable that matches this pattern
@@ -1115,7 +1137,7 @@ namespace build2
     // for the insertion order (you probably want more specific first).
     //
   public:
-    void
+    LIBBUILD2_SYMEXPORT void
     insert_pattern (const string& pattern,
                     optional<const value_type*> type,
                     optional<bool> overridable,
@@ -1154,16 +1176,16 @@ namespace build2
     rw (scope&) const {return const_cast<variable_pool&> (*this);}
 
   private:
-    static variable_pool instance;
+    LIBBUILD2_SYMEXPORT static variable_pool instance;
 
-    variable&
+    LIBBUILD2_SYMEXPORT variable&
     insert (string name,
             const value_type*,
             const variable_visibility* = nullptr,
             const bool* overridable = nullptr,
             bool pattern = true);
 
-    void
+    LIBBUILD2_SYMEXPORT void
     update (variable&,
             const value_type*,
             const variable_visibility* = nullptr,
@@ -1173,10 +1195,12 @@ namespace build2
     //
     friend class parser;
     friend class scope;
-    friend variable_overrides reset (const strings&);
+    friend LIBBUILD2_SYMEXPORT variable_overrides reset (const strings&);
 
   public:
-    static const variable_pool& cinstance; // For var_pool initialization.
+    // For var_pool initialization.
+    //
+    LIBBUILD2_SYMEXPORT static const variable_pool& cinstance;
 
     // Variable map.
     //
@@ -1243,7 +1267,7 @@ namespace build2
     bool global_;
   };
 
-  extern const variable_pool& var_pool;
+  LIBBUILD2_SYMEXPORT extern const variable_pool& var_pool;
 }
 
 // variable_map
@@ -1275,7 +1299,7 @@ namespace butl
 
 namespace build2
 {
-  class variable_map
+  class LIBBUILD2_SYMEXPORT variable_map
   {
   public:
     struct value_data: value
@@ -1442,8 +1466,10 @@ namespace build2
   // main()). This shard is also used for value typification (which is kind of
   // like caching) during concurrent execution phases.
   //
-  extern size_t variable_cache_mutex_shard_size;
-  extern unique_ptr<shared_mutex[]> variable_cache_mutex_shard;
+  LIBBUILD2_SYMEXPORT extern size_t variable_cache_mutex_shard_size;
+
+  LIBBUILD2_SYMEXPORT extern unique_ptr<shared_mutex[]>
+  variable_cache_mutex_shard;
 
   template <typename K>
   class variable_cache
@@ -1522,7 +1548,7 @@ namespace build2
     map_type map_;
   };
 
-  class variable_type_map
+  class LIBBUILD2_SYMEXPORT variable_type_map
   {
   public:
     using map_type = std::map<reference_wrapper<const target_type>,
@@ -1564,7 +1590,7 @@ namespace build2
   };
 }
 
-#include <build2/variable.ixx>
-#include <build2/variable.txx>
+#include <libbuild2/variable.ixx>
+#include <libbuild2/variable.txx>
 
-#endif // BUILD2_VARIABLE_HXX
+#endif // LIBBUILD2_VARIABLE_HXX
diff --git a/build2/variable.ixx b/libbuild2/variable.ixx
index 559151b..f0bde09 100644
--- a/build2/variable.ixx
+++ b/libbuild2/variable.ixx
@@ -1,9 +1,11 @@
-// file      : build2/variable.ixx -*- C++ -*-
+// file      : libbuild2/variable.ixx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
 #include <type_traits> // is_same
 
+#include <libbuild2/export.hxx>
+
 namespace build2
 {
   // value
@@ -150,6 +152,8 @@ namespace build2
 
     // Find base if any.
     //
+    // Note that here we use the value type address as type identity.
+    //
     const value_type* b (v.type);
     for (;
          b != nullptr && b != &value_traits<T>::value_type;
@@ -271,7 +275,7 @@ namespace build2
       typify (v, t, var);
   }
 
-  void
+  LIBBUILD2_SYMEXPORT void
   typify (value&, const value_type&, const variable*, memory_order);
 
   inline void
@@ -729,8 +733,7 @@ namespace build2
         // Note that this will only move values. Keys (being const) are still
         // copied.
         //
-        m.insert (m.end (),
-                  make_move_iterator (x.begin ()),
+        m.insert (make_move_iterator (x.begin ()),
                   make_move_iterator (x.end ()));
     }
     else
diff --git a/build2/variable.txx b/libbuild2/variable.txx
index 1aba99d..9b7490a 100644
--- a/build2/variable.txx
+++ b/libbuild2/variable.txx
@@ -1,8 +1,8 @@
-// file      : build2/variable.txx -*- C++ -*-
+// file      : libbuild2/variable.txx -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#include <build2/diagnostics.hxx>
+#include <libbuild2/diagnostics.hxx>
 
 namespace build2
 {
diff --git a/libbuild2/version.hxx b/libbuild2/version.hxx
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/libbuild2/version.hxx
diff --git a/build2/version.hxx.in b/libbuild2/version.hxx.in
index d6be346..1e448d8 100644
--- a/build2/version.hxx.in
+++ b/libbuild2/version.hxx.in
@@ -1,8 +1,8 @@
-// file      : build2/version.hxx.in -*- C++ -*-
+// file      : libbuild2/version.hxx.in -*- C++ -*-
 // copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
 // license   : MIT; see accompanying LICENSE file
 
-#ifndef BUILD2_VERSION // Note: using the version macro itself.
+#ifndef LIBBUILD2_VERSION // Note: using the version macro itself.
 
 // The numeric version format is AAAAABBBBBCCCCCDDDE where:
 //
@@ -26,21 +26,21 @@
 // NOTE: remember to also update "fake" bootstrap values in utility.hxx if
 // changing anything here.
 
-#define BUILD2_VERSION       $build2.version.project_number$ULL
-#define BUILD2_VERSION_STR   "$build2.version.project$"
-#define BUILD2_VERSION_ID    "$build2.version.project_id$"
+#define LIBBUILD2_VERSION       $build2.version.project_number$ULL
+#define LIBBUILD2_VERSION_STR   "$build2.version.project$"
+#define LIBBUILD2_VERSION_ID    "$build2.version.project_id$"
 
-#define BUILD2_VERSION_MAJOR $build2.version.major$
-#define BUILD2_VERSION_MINOR $build2.version.minor$
-#define BUILD2_VERSION_PATCH $build2.version.patch$
+#define LIBBUILD2_VERSION_MAJOR $build2.version.major$
+#define LIBBUILD2_VERSION_MINOR $build2.version.minor$
+#define LIBBUILD2_VERSION_PATCH $build2.version.patch$
 
-#define BUILD2_PRE_RELEASE   $build2.version.pre_release$
+#define LIBBUILD2_PRE_RELEASE   $build2.version.pre_release$
 
-#define BUILD2_SNAPSHOT      $build2.version.snapshot_sn$ULL
-#define BUILD2_SNAPSHOT_ID   "$build2.version.snapshot_id$"
+#define LIBBUILD2_SNAPSHOT      $build2.version.snapshot_sn$ULL
+#define LIBBUILD2_SNAPSHOT_ID   "$build2.version.snapshot_id$"
 
 #include <libbutl/version.hxx>
 
 $libbutl.check(LIBBUTL_VERSION, LIBBUTL_SNAPSHOT)$
 
-#endif // BUILD2_VERSION
+#endif // LIBBUILD2_VERSION
diff --git a/old-tests/depdb/driver.cxx b/old-tests/depdb/driver.cxx
index b95d299..64668a1 100644
--- a/old-tests/depdb/driver.cxx
+++ b/old-tests/depdb/driver.cxx
@@ -6,10 +6,10 @@
 
 #include <libbutl/filesystem.mxx>
 
-#include <build2/types.hxx>
-#include <build2/utility.hxx>
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
 
-#include <build2/depdb.hxx>
+#include <libbuild2/depdb.hxx>
 
 using namespace std;
 using namespace build2;
diff --git a/tests/libbuild2/buildfile b/tests/libbuild2/buildfile
new file mode 100644
index 0000000..4d3a42f
--- /dev/null
+++ b/tests/libbuild2/buildfile
@@ -0,0 +1,12 @@
+# file      : tests/libbuild2/buildfile
+# copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+import libs = build2%lib{build2}
+
+exe{driver}: {hxx cxx}{*} $libs testscript
+
+# Setup the test driver. Note that by default we test the build2 driver (see
+# build/root.build for details).
+#
+testscript@./: test = exe{driver}
diff --git a/tests/libbuild2/driver.cxx b/tests/libbuild2/driver.cxx
new file mode 100644
index 0000000..3df2fbe
--- /dev/null
+++ b/tests/libbuild2/driver.cxx
@@ -0,0 +1,24 @@
+// file      : tests/libbuild2/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/context.hxx>   // sched, reset()
+#include <libbuild2/scheduler.hxx>
+
+using namespace build2;
+
+int
+main (int, char* argv[])
+{
+  // Fake build system driver, default verbosity.
+  //
+  init_diag (1);
+  init (argv[0]);
+  sched.startup (1);  // Serial execution.
+  reset (strings ()); // No command line variables.
+
+  return 0;
+}
diff --git a/tests/libbuild2/testscript b/tests/libbuild2/testscript
new file mode 100644
index 0000000..35c2c5f
--- /dev/null
+++ b/tests/libbuild2/testscript
@@ -0,0 +1,7 @@
+# file      : tests/libbuild2/testscript
+# copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+: basic
+:
+$*
diff --git a/tests/test/script/builtin/cp.testscript b/tests/test/script/builtin/cp.testscript
index 5f69f05..aa16465 100644
--- a/tests/test/script/builtin/cp.testscript
+++ b/tests/test/script/builtin/cp.testscript
@@ -358,6 +358,18 @@ if ($cxx.target.class != 'windows')
       EOE
     }
 
+    # @@ Temporary disable the test as it may fail if the package is fetched
+    #    from the git repository location. Note that the used `ls -l` command
+    #    displays the filesystem entry modification time with the minute
+    #    resolution and the build2 dist meta-operation doesn't preserve the
+    #    directory modification time. That's why the test command may
+    #    unexpectedly succeed.
+    #
+    #    One way to fix it is to instruct ls to show time with at least the
+    #    second resolution. There is no portable way for that across different
+    #    OSes but all of them seems to provide some option to achieve that.
+    #
+#\
     : dir
     :
     {
@@ -372,5 +384,6 @@ if ($cxx.target.class != 'windows')
       %.+
       EOE
     }
+#\
   }
 }