Building packages for a variety of systems

[Bob Healey]

I would like to move from building ports with my custom options on each 
system, and move to building once in a central location, and then 
deploying via pkg add.  Mainly openldap, samba, BIND, and their 
dependencies.  Do I need to use my oldest CPU (Opteron 1000 series) as 
the build host, or can I get away with using something much newer (Xeon 
E5-2000 v3) with more cores and RAM?  I'm seeing mixed opinions about 
ports hard coding build CPU features into binaries, and don't want to 
get stuck.

Thank you for your time.

-- 
Bob Healey
Systems Administrator
Office of Research