--- cups-1.4.2.orig/scheduler/auth.c	2009-05-27 00:01:23.000000000 +0200
+++ cups-1.4.2/scheduler/auth.c	2009-12-30 12:30:13.000000000 +0100
@@ -57,6 +57,7 @@
  * Include necessary headers...
  */
 
+#define _GNU_SOURCE
 #include "cupsd.h"
 #include <grp.h>
 #ifdef HAVE_SHADOW_H