[Chilli] Build fails on FreeBSD

[Sevan / Venture37]

Hi Dave,
As requested, built r473 from svn, build fails with following error, 
disabling IPv6 support or commenting out line 532 in pkt.h allows the 
build to complete sucessfully.


Sevan

/bin/sh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. 
-I..    -D_GNU_SOURCE -Wall -Werror -fno-builtin -fno-stric
t-aliasing -O2 -fomit-frame-pointer -funroll-loops -pipe -I../bstring 
-DDEFCHILLICONF='"/usr/local/etc/chilli.conf"' -DDEFPIDFIL
E='"/var/run/chilli.pid"' -DDEFSTATEDIR='"/var/run"' 
-DSBINDIR='"/usr/local/sbin"'    -g -O2 -MT chilli.lo -MD -MP -MF .deps/chi
lli.Tpo -c -o chilli.lo chilli.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -D_GNU_SOURCE -Wall 
-Werror -fno-builtin -fno-strict-aliasing -O2 -fomit-frame-p
ointer -funroll-loops -pipe -I../bstring 
-DDEFCHILLICONF=\"/usr/local/etc/chilli.conf\" 
-DDEFPIDFILE=\"/var/run/chilli.pid\" -DD
EFSTATEDIR=\"/var/run\" -DSBINDIR=\"/usr/local/sbin\" -g -O2 -MT 
chilli.lo -MD -MP -MF .deps/chilli.Tpo -c chilli.c  -fPIC -DPIC
  -o .libs/chilli.o
In file included from tun.h:24,
		 from chilli.h:25,
		 from chilli.c:20:
pkt.h:532:1: error: "tcp6hdr" redefined
In file included from system.h:155,
		 from chilli.h:23,
		 from chilli.c:20:
/usr/include/netinet/tcp.h:44:1: error: this is the location of the 
previous definition
gmake[3]: *** [chilli.lo] Error 1