The q3map2 that is included in our beta 2.2 release is the one you should be compiling maps with for this game.
And here is wq3 q3map2 sources so that maybe someone will make working versions for Linux, Mac, FreeBSD, etc.
And I believe the original q3map2 source by ydnar can be found here now included with the GtkRadiant source. This is what El Vakond used to update the wq3 compiler for beta 2.2.