[CentOS] Unbound, dns64 and CentOS 7

Hi all,

Is anyone using unbound to do dns64 on CentOS 7? A quick 'unbound -h' 
shows both 'validator' and 'iterator' modules, but no dns64. Was it just 
not included or is there a supplementary or alternative package I need 
to install?

I had it working on CentOS 6 and don't recall any special setup, so when 
I realized the dns64 module was missing from unbound in CentOS 7, it 
kinda caught me off guard.

jb