--- libs-external/USI++/src/ip.cc.orig	2005-07-27 03:38:15.000000000 -0500
+++ libs-external/USI++/src/ip.cc	2014-11-05 00:31:52.000000000 -0600
@@ -13,6 +13,7 @@
 #include "usi++/ip.h"
 
 #include "config.h"
+#include <cstdlib>
 #include <iostream>
 #include <string.h>
 #include <errno.h>