--- mutter-3.16.1.1/src/backends/native/meta-barrier-native.c.orig	2015-04-30 01:50:45.985747451 +0200
+++ mutter-3.16.1.1/src/backends/native/meta-barrier-native.c	2015-04-30 01:49:57.490401299 +0200
@@ -31,7 +31,7 @@
 #include "config.h"
 
 #include <stdlib.h>
-
+#include <math.h>
 #include <meta/barrier.h>
 #include <meta/util.h>
 #include "backends/meta-backend-private.h"