How to build a BROKEN port?

[Da Rock]

Pardon me for being the queer one to ask this- but how does one 
force/override building a port marked as broken?

I'm not about to run a make install clean on it, but I would like to at 
least have a crack at trying to fix whats wrong. In this particular case 
its involving a particular arch, and seeing as I have this arch I'd 
reckon I'm an ideal candidate to try and help fix it :)

I poked around for a bit for an answer, but pretty much all the info is 
on how to mark it as broken- not overriding it.