--- configure.orig	2009-12-31 11:28:03.192102171 +0100
+++ configure	2009-12-31 14:03:26.073302498 +0100
@@ -39958,7 +39958,7 @@ _ACEOF
 
     # Overrides _POSIX_C_SOURCE
     cat >>confdefs.h <<\_ACEOF
-#define _XOPEN_SOURCE 500
+#define _XOPEN_SOURCE 600
 _ACEOF