--- process/process.orig	2013-12-30 10:13:10 UTC
+++ process/process
@@ -5,6 +5,10 @@
 #include <ostream>
 #include <istream>
 
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+#include <csignal>
+#endif
+
 #include <bobcat/fork>
 #include <bobcat/string>
 #include <bobcat/pipe>