--- src/vsp_graphic/src/Shader.cpp.orig	2017-01-08 05:14:57 UTC
+++ src/vsp_graphic/src/Shader.cpp
@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <string>
+#include <stdlib.h>
 
 #include "Shader.h"