How to reconfigure a port installation?

[Curtis Vaughan]

I was installing a port (make && make install) during which it asked me 
about some configuration information. Because I made a wrong choice at 
one point, the install failed. Now, I want to run make install again in 
order to chose the right options. Unfortunately, I can't just issue 
that command, as it apparently proceeds with what information I gave it 
the first time. Out of curiosity I tried make deinstall and pkg_delete, 
but they don't work as the port was never installed. So, what command 
to I need to issue?

Curtis