diff -urN gtksourceview-1.8.5/gtksourceview/gtksourceregex.c gtksourceview-1.8.5.new/gtksourceview/gtksourceregex.c
--- gtksourceview-1.8.5/gtksourceview/gtksourceregex.c	2007-01-03 16:40:28.000000000 +0100
+++ gtksourceview-1.8.5.new/gtksourceview/gtksourceregex.c	2008-11-10 11:54:10.000000000 +0100
@@ -18,6 +18,8 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
+#define _GNU_SOURCE 1
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif