dns/unbound patch error

[Grzegorz Junka]

I remember something was mentioned on this list about unbound. Currently 
it fails for me with the following error:

===>  Patching for unbound-1.6.6
/bin/cat 
/wrkdirs/usr/ports/dns/unbound/work/unbound-1.6.6/contrib/aaaa-filter-iterator.patch 
| /usr/bin/patch -d /wrkdirs/usr/ports/dns/unbound/work/unbound-1.6.6 -p1 -s
1 out of 3 hunks failed--saving rejects to iterator/iterator.h.rej
*** Error code 1

Stop.
make: stopped in /usr/ports/dns/unbound
====>> Cleaning up wrkdir
===>  Cleaning for unbound-1.6.6
build of dns/unbound ended at Mon Sep 25 00:40:44 UTC 2017
build time: 00:00:06
!!! build failure encountered !!!

Is this a known issue?

GrzegorzJ