--- mutter-3.18.2/src/backends/meta-cursor-renderer.c.orig	2015-12-13 13:57:50.161557488 +0100
+++ mutter-3.18.2/src/backends/meta-cursor-renderer.c	2015-12-13 13:56:43.415124424 +0100
@@ -33,6 +33,7 @@
 #include <clutter/clutter.h>
 
 #include "meta-stage.h"
+#include <math.h>
 
 struct _MetaCursorRendererPrivate
 {