--- wxgui/ceria.cpp.orig	2015-05-25 17:42:29 UTC
+++ wxgui/ceria.cpp
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <cmath>
+#include <stdlib.h>
 #include <assert.h>
 #include <string.h>
 #include <algorithm>
