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+// file      : BOOTSTRAP-UNIX.cli
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+"
+The following instructions are for bootstrapping \c{build2} on UNIX-like
+operating systems (GNU/Linux, FreeBSD, etc). For Mac OS X first see
+\l{#BOOTSTRAP-MACOSX Bootstrapping on Mac OS X}. These instructions should
+also be used for UNIX emulation layers on Windows (for example, MSYS2 or
+Cygwin) where you already have a UNIX shell with standard utilitis.
+
+\dl|
+
+\li|1. Create Build Directory\n
+
+Note that you will want to keep this directory around in order to upgrade to
+new toolchain versions in the future. In this guide we will use
+\c{~/build2-build/} as the build directory and \c{/usr/local/} as the
+installation directory but you can use other paths.
+
+\
+$ cd
+$ mkdir build2-build
+$ cd build2-build
+\
+
+|
+
+\li|\n2. Download, Verify, and Unpack\n
+
+Download \c{build2-toolchain-X.Y.Z.tar.xz} (or its \c{.tar.gz} variant if you
+don't have \cb{xz(1)}) as well as its \c{.sha256} checksum from
+\l{https://download.build2.org}, into \c{~/build2-build/} (build directory).
+
+Verify the archive checksum matches:
+
+\
+# Linux, MSYS, Cygwin:
+#
+$ sha256sum -c build2-toolchain-X.Y.Z.tar.xz.sha256
+
+# Mac OS X:
+#
+$ shasum -a 256 -c build2-toolchain-X.Y.Z.tar.xz.sha256
+
+# FreeBSD:
+#
+$ sha256 -r build2-toolchain-X.Y.Z.tar.xz
+$ cat build2-toolchain-X.Y.Z.tar.xz.sha256
+\
+
+Unpack the archive and change to its directory:
+
+\
+> tar xf build2-toolchain-X.Y.Z.tar.xz
+> cd build2-toolchain-X.Y.Z
+\
+
+||
+
+Next you can either perform the rest of the steps manually or, if you are
+happy with using the defaults, run the \c{build.sh} shell script. It performs
+(and echoes) the same set of steps as outline below but only allows you to
+customization the compiler and installation directory (run \c{build.sh -h} for
+usage) and you can also specify an alternative package repository with the
+\c{BUILD2_REPO} environment variable.
+
+For example, this command will use \c{g++-5} and install the toolchain into
+\c{/usr/local/}.
+
+\
+$ build.sh g++-5
+\
+
+While this will use Clang and install into \c{/opt/build2}:
+
+\
+$ build.sh --install-dir /opt/build2 --sudo sudo clang++
+\
+"