--- rcs.h.orig	2011-04-20 20:46:33.000000000 +0200
+++ rcs.h	2011-04-20 21:02:54.000000000 +0200
@@ -28,6 +28,7 @@
 #define RCS_H
 
 #include <stdio.h>
+#include <time.h>
 
 #include "buf.h"