Initialize git submodules at bootstrap

* bootstrap: Call git submodule init/update if a git
	directory is set.
Signed-off-by: Thomas Moulard <thomas.moulard@gmail.com>

ChangeLog

+2009-07-28  Thomas Moulard  <thomas.moulard@gmail.com>
+
+	Initialize git submodules at boostrap.
+	* bootstrap: Call git submodule init/update if a git
+	directory is set.
+
 2009-05-28  Florent Lamiraux  <florent@laas.fr>
 
 	Install missing file.

bootstrap

 #! /bin/sh
+
+# Print an error message and exit.
+die ()
+{
+    echo >&2 "fatal: $1"
+    exit 2
+}
+
+# Make sure that the submodule are retrieved.
+if test -d ".git"; then
+    git submodule init
+    git submodule update
+fi
+
 exec build-aux/bootstrap