Build error on FreeBSD with v1.8.5 and option ipv6

[parcival]

Hi all,
i get this error with build zabbix 1.8.5 on FreeBSD 8.2 and option "ipv6".

comms.c: In function 'zbx_tcp_listen':
comms.c:765: error: 'SOL_IPV6' undeclared (first use in this function)
comms.c:765: error: (Each undeclared identifier is reported only once
comms.c:765: error: for each function it appears in.)
*** Error code 1

Problem is this Fix:

https://support.zabbix.com/browse/ZBX-3548

with zabbix 1.8.4 there are no problems.

Possibly an idea?
Thanks for each assistance.

parcival