Jose, what I always do in such situations is google the error. A quick&dirty look finds this posting which suggests that you may not have tcl compiled with threads enabled on your machine.
Are you trying to use the tcl installed by OS X? I would install tcl directly if you haven't, and make sure that you compile the other stuff (aolserver, pg) with that tcl. I think that's what I did, but it's over a year ago and I've long since martyred those brain cells. 😉