completly remove (or modify) a port

[Ray]

Hello all,
I have been trying to work with postfix from the ports collection.
I need to rebuild it to include mysql support. I tried 
#make deinstall
but a subsequent
#make install 
doesn't give me the options screen.
what is the way to either remove the stored configuration file, or to manually 
pass the parameters to make.  A look at the Makefile and the other files 
in /usr/ports/mail/postfix didn't turn up any hints.
Thanks,
Ray