Perhaps I'm missing something, but wouldn't it be
easier to obtain expat for your *nix boxes given the availabiltiy of C compliers on those platforms? Also, a lot (if not all) of them have package managers (Red Hat has rpm, Debian has apt, etc...) for which a pre-compiled version of expat should be available. I've been wrong before, though. *shrug*
thor
Feel the white light, the light within
Be your own disciple, fan the sparks of will
With all of us waiting, your kingdom will come