--- main.cpp.orig	2008-04-26 21:00:28.000000000 -0400
+++ main.cpp	2008-04-26 21:00:53.000000000 -0400
@@ -34,6 +34,7 @@
 
 #include <iostream>
 #include <stdexcept>
+#include <cstdlib>
 
 using namespace std;