--- l2tpns-2.1.21.orig/cluster.c	2006-12-02 15:09:14.000000000 +0100
+++ l2tpns-2.1.21/cluster.c	2013-12-21 14:33:19.000000000 +0100
@@ -2,6 +2,7 @@
 
 char const *cvs_id_cluster = "$Id: cluster.c,v 1.50.2.1 2006/12/02 14:09:14 bodea Exp $";
 
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>