From da19f88659c12f00939945d4d3fbb1a48bac7e7e Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 30 Aug 2013 17:06:17 -0400
Subject: only expose struct tcphdr under _GNU_SOURCE

the BSD and GNU versions of this structure differ, so exposing it in
the default _BSD_SOURCE profile is possibly problematic. both versions
could be simultaneously supported with anonymous unions if needed in
the future, but for now, just omitting it except under _GNU_SOURCE
should be safe.
---
 include/netinet/tcp.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/netinet/tcp.h b/include/netinet/tcp.h
index b8c79349..8266f21d 100644
--- a/include/netinet/tcp.h
+++ b/include/netinet/tcp.h
@@ -31,8 +31,10 @@
 #define SOL_TCP 6
 #include <sys/types.h>
 #include <sys/socket.h>
-#include <endian.h>
+#endif
 
+#ifdef _GNU_SOURCE
+#include <endian.h>
 struct tcphdr
 {
 	u_int16_t source;
-- 
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