can not set mss on FreeBSD 10

[k simon]

Hi,Lists,
  I found haproxy 1.4.25 can not set mss on FreeBSD 10-stable as below:

# /usr/local/sbin/haproxy -f /opt/etc/haproxy.conf
[WARNING] 132/170407 (71806) : Starting frontend http-in: cannot set MSS

# haproxy -vv
HA-Proxy version 1.4.25 2014/03/27
Copyright 2000-2014 Willy Tarreau <w...@1wt.eu>

Build options :
  TARGET  = freebsd
  CPU     = generic
  CC      = gcc47
  CFLAGS  = -g -Wall -O2 -pipe -msse3 -I/usr/local/include
-L/usr/local/lib -fno-strict-aliasing -DFREEBSD_PORTS
  OPTIONS = USE_TPROXY=1 USE_PCRE=1

Default settings :
  maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200

Encrypted password support via crypt(3): yes

Available polling systems :
     kqueue : pref=300,  test result OK
       poll : pref=200,  test result OK
     select : pref=150,  test result OK
Total: 3 (3 usable), will use kqueue.


Regards
Simon