diff -Naur knock-0.5-orig/src/knockd.c knock-0.5/src/knockd.c

--- knock-0.5-orig/src/knockd.c	2005-06-27 08:11:34 +0300

+++ knock-0.5/src/knockd.c	2008-11-25 09:39:47 +0200

@@ -46,6 +46,7 @@

 #include <syslog.h>

 #include <pcap.h>

 #include <errno.h>

+#include <limits.h>

 #include "list.h"

 static char version[] = "0.5";