[gdl] build: Fix generation of the documentation for out-of-source build

[Sebastien Granjoux <sgranjoux src gnome org>]

commit 705f29a94bec8b344bec73b1641a5b569ad1fe68
Author: SÃbastien Granjoux <seb sfo free fr>
Date:   Sat May 5 17:01:31 2012 +0200

    build: Fix generation of the documentation for out-of-source build

 docs/reference/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/Makefile.am b/docs/reference/Makefile.am
index 9adf6b2..1204ea1 100644
--- a/docs/reference/Makefile.am
+++ b/docs/reference/Makefile.am
@@ -21,7 +21,7 @@ DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.sgml
 # gtk-doc will search all .c & .h files beneath here for inline comments
 # documenting the functions and macros.
 # e.g. DOC_SOURCE_DIR=../../../gtk
-DOC_SOURCE_DIR=../../gdl
+DOC_SOURCE_DIR=$(top_srcdir)/gdl
 
 # Extra options to pass to gtkdoc-scangobj. Not normally needed.
 SCANGOBJ_OPTIONS=