autogen.sh: fail faster/clearer if g-i not found

GOBJECT_INTROSPECTION_CHECK macro can be missing if introspection
is not installed, so this way the following error is prevented:

"gtk/Makefile.am:1324: error: HAVE_INTROSPECTION does not appear
in AM_CONDITIONAL"

https://bugzilla.gnome.org/show_bug.cgi?id=723438

diff --git a/autogen.sh b/autogen.sh
index 17ee16a58c35a07ae6630056694b54fb4246014e..250f80d25e7fc9650d7098bfcd92e955b2ccbc1a 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -17,6 +17,18 @@ else
         gtkdocize || exit $?
 fi
 
+PKGCONFIG=`which pkg-config`
+if test -z "$PKGCONFIG"; then
+        echo "*** pkg-config not found, please install it ***"
+        exit 1
+fi
+
+pkg-config --print-errors gobject-introspection-1.0
+if [ $? != 0 ]; then
+       echo "You probably need to install 'libgirepository1.0-dev'"
+       exit 1
+fi
+
 # README and INSTALL are required by automake, but may be deleted by clean
 # up rules. to get automake to work, simply touch these here, they will be
 # regenerated from their corresponding *.in files by ./configure anyway.