--- sysdep/bsd/sysio.h.orig	2014-09-26 09:31:32.284787124 +0200

+++ sysdep/bsd/sysio.h	2014-09-26 09:31:35.391786781 +0200

@@ -6,6 +6,8 @@

  *	Can be freely distributed and used under the terms of the GNU GPL.

  */

+#include <sys/param.h>

+

 #include <net/if_dl.h>

 #include <netinet/in_systm.h> // Workaround for some BSDs

 #include <netinet/ip.h>

@@ -175,8 +179,8 @@

   ip->ip_src = ipa_to_in4(s->saddr);

   ip->ip_dst = ipa_to_in4(s->daddr);

-#ifdef __OpenBSD__

-  /* OpenBSD expects ip_len in network order, other BSDs expect host order */

+#if defined __OpenBSD__ || (defined __FreeBSD__ && (__FreeBSD_version >= 1100030))

+  /* OpenBSD and FreeBSD (since 11) expects ip_len in network order, other BSDs expect host order */

   ip->ip_len = htons(ip->ip_len);

 #endif

 }