4 files changed, 6 insertions, 1 deletions
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..662f361
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "upstream/odb"]
+	path = upstream/odb
+	url = https://git.codesynthesis.com/odb/odb.git
diff --git a/README-GIT b/README-GIT
index 1ca0940..de9bc9c 100644
--- a/README-GIT
+++ b/README-GIT
@@ -1,3 +1,5 @@
+Note that this repository uses git submodules.
+
 The checked out libbutl/version.hxx will be overwritten during the build
 process but these changes should be ignored. To do this automatically, run:
 
diff --git a/buildfile b/buildfile
index 1097d1f..e1b94fa 100644
--- a/buildfile
+++ b/buildfile
@@ -1,7 +1,7 @@
 # file      : buildfile
 # license   : MIT; see accompanying LICENSE file
 
-./: {*/ -build/}                                              \
+./: {*/ -build/ -upstream/}                                   \
     doc{INSTALL NEWS README} legal{LICENSE COPYRIGHT AUTHORS} \
     manifest
 
diff --git a/upstream/odb b/upstream/odb
new file mode 160000
+Subproject 5e8f2c7e0357b770adee8a46801fa7dd2dedb94