--- common/system.h.orig 2012-01-16 14:45:01.339140488 -0600
+++ common/system.h 2012-01-16 14:45:27.155421605 -0600
@@ -20,6 +20,7 @@
#ifndef COMMON_SYSTEM_H
#define COMMON_SYSTEM_H
+#include <unistd.h>
#include <cstdlib>
// These two will not be transmitted to our parent, so we don't need to