Where to edit source

[Eric Tiffany]

Ok, I need to edit the source for a port (tetex) to increase one of its
arcane parameters.  I'm struggling with how I extract the source, edit the
file, and get port to build the new version.

I suppose I could add a patch, but since this is just a local change for me,
it seems like overkill.

I have done 'port extract tetex' but it doesn't seem to do anything.  Am I
barking up the wrong tree?

Thanks,

ET