diff -Nurd busybox-1.11.3.orig//networking/libiproute/iptunnel.c busybox-1.11.3/networking/libiproute/iptunnel.c
--- busybox-1.11.3.orig//networking/libiproute/iptunnel.c	2009-10-29 12:49:58.000000000 +0100
+++ busybox-1.11.3/networking/libiproute/iptunnel.c	2009-10-29 12:50:33.000000000 +0100
@@ -21,6 +21,7 @@
 #ifndef __constant_htons
 #define __constant_htons htons
 #endif
+#include <asm/byteorder.h>
 #include <linux/if_tunnel.h>
 
 #include "ip_common.h"  /* #include "libbb.h" is inside */