From owner-freebsd-ports@freebsd.org  Tue Dec 12 15:30:15 2017
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To: freebsd-ports@freebsd.org
References: <ee5e3dff-e3f5-588b-15a8-b1d6807727e8@freebsd.org>
Subject: Re: somone able to make a simple fix to net/ftp?
From: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
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Date: Tue, 12 Dec 2017 16:30:06 +0100
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Have you tried mail it the maintainer?

I am not really sure, but I think, this is what you want:

--- lft_lib.h.orig      2017-12-11 20:00:24 UTC
+++ lft_lib.h
@@ -277,7 +277,7 @@ typedef struct _incomicmpicmp
  #define EVT_INCOMING_ICMP_ICMP         75
  #define EVT_RCVD_ICMP_ICMP             76

-#if defined(BSD_IP_STACK) && !defined(OPENBSD)
+#if defined(BSD_IP_STACK) && (!defined(OPENBSD) || 
(defined(__FreeBSD__) &&  __FreeBSD_version >= 1100000))
  #define SCREWED_IP_LEN
  #endif