--- intern/opensubdiv/opensubdiv_converter.cc.orig	2015-11-02 13:25:37 UTC
+++ intern/opensubdiv/opensubdiv_converter.cc
@@ -24,6 +24,7 @@
  */
 
 #include <cstdio>
+#include <cstdlib>
 #include <vector>
 
 #ifdef _MSC_VER