--- configure.ac.orig	2013-11-18 00:34:59.000000000 +0100
+++ configure.ac	2013-11-18 00:35:37.000000000 +0100
@@ -1,5 +1,5 @@
 AC_INIT([netgen],[5.1],[],[])
-AM_INIT_AUTOMAKE([-Wall -Werror foreign])
+AM_INIT_AUTOMAKE([-Wall -Wno-extra-portability -Werror foreign])
 
 AC_CONFIG_MACRO_DIR([m4])