pkgtool.conf?

[Vic FreeBSD]

I need to compile some of my pet programs from the ports according to specific 
configure options valid of course for each of them (I mean the options that 
go with the "make" command).
Somewhere in the internet I read something about an /etc/pkgtool.conf allowing 
those tailoring but looking for /etc/pkgtool.conf both in www.freebsd.org and 
in the internet I could find pieces of rubbish only, it al seems to be 
vanished.  

Any suggestion to reach my purpose?

Ciao
Vittorio