--- build-tree/grep-2.5.3/configure.orig	2008-07-17 00:48:27.000000000 +0200
+++ build-tree/grep-2.5.3/configure	2008-07-17 00:33:48.000000000 +0200
@@ -3679,6 +3679,9 @@
 fi
 
 
+#cat >>confdefs.h <<\_ACEOF
+# #define _GNU_SOURCE 1
+#_ACEOF
 
 
    # Check whether --enable-largefile was given.