wxMaxima port

I tried to port wxmaxima; it failed because I already had maxima installed (/usr/local/bin/maxima). Now the obvious solution would be to also use macports to install maxima. In fact, I did try this a couple of months ago, only to see it fail because it could not install the dependency sbcl. At the time, I just gave up on macports, installed sbcl and then maxima from the source. This worked out fine. Probably, I can do the same with wxmaxima. But I'd rather start using macports, if possible. What can be done, if anything, to circumvent the problem of dependencies where something has already been built independently of macports? John Doner