--- signal/signal.orig	2013-10-02 12:35:59.000000000 +0200
+++ signal/signal	2013-11-27 14:28:38.000000000 +0100
@@ -1,6 +1,10 @@
 #ifndef INCLUDED_SIGNAL_
 #define INCLUDED_SIGNAL_
 
+#ifdef __FreeBSD__
+#include <stdlib.h>
+#endif
+
 #include <vector>
 #include <signal.h>