--- ptunnel-0.61.orig/ptunnel.h	2005-07-13 11:57:27.000000000 +0200
+++ ptunnel-0.61/ptunnel.h	2013-12-28 18:22:22.000000000 +0100
@@ -44,7 +44,7 @@
 	#define PING_TUNNEL_H
 
 //	Includes
-	#include	<sys/unistd.h>
+	#include	<unistd.h>
 	#include	<sys/types.h>
 	#include	<sys/socket.h>
 	#include	<netinet/in.h>