--- process/process.orig	2013-11-13 11:45:02.000000000 +0100
+++ process/process	2013-11-27 16:52:35.000000000 +0100
@@ -5,6 +5,10 @@
 #include <ostream>
 #include <istream>
 
+#ifdef __FreeBSD__
+#include <signal.h>
+#endif
+
 #include <bobcat/fork>
 #include <bobcat/string>
 #include <bobcat/pipe>