--- Tools/DumpRenderTree/gtk/ImageDiff.cpp.orig	2013-09-11 12:29:19.000000000 +0200
+++ Tools/DumpRenderTree/gtk/ImageDiff.cpp	2013-09-11 12:29:38.000000000 +0200
@@ -30,6 +30,7 @@
 #include <algorithm>
 #include <cmath>
 #include <cstdio>
+#include <cstdlib>
 #include <cstring>
 #include <gdk/gdk.h>