[gegl-gtk] Build: Set plugindir manually if not found in gegl.pc file

[Jon Nordby <jonnor src gnome org>]

commit 1ab6ae4d1835fd87a610fb07fa11e43f8c69f645
Author: Jon Nordby <jononor gmail com>
Date:   Thu Jul 21 17:26:05 2011 +0200

    Build: Set plugindir manually if not found in gegl.pc file
    
    This makes gegl-gtk work with gegl stable.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 09c33e6..71bd27b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -108,8 +108,8 @@ AC_SUBST(PACKAGE_NAME)
 
 GEGL_PLUGINS_DIR=`pkg-config gegl --variable=pluginsdir`
 if test -z $GEGL_PLUGINS_DIR; then
-	AC_MSG_ERROR(
-        [no pluginsdir set in GEGL pkg-config file])
+	GEGL_PREFIX=`pkg-config gegl --variable=prefix`
+	GEGL_PLUGINS_DIR=$GEGL_PREFIX/lib/gegl-0.1
 fi
 AC_SUBST(GEGL_PLUGINS_DIR)