[Zope] Asyncore.py

Hi; For some reason my new build of Zope-2.4.1 didn't build certain files, including asyncore.py and asyncore.pyc (in ZServer/medusa). I'm suspecting the reason is because I have 2 versions of python running and in order to specify the latest I must type python2.1 at the command prompt. Is there some way to specify this version of python in the build, or does it look for this automatically, or am I missing something else? TIA, BenO