If the game is crashing for you near startup with a SIGILL instruction,
you probably have an older Athlon chip. We put a new installer up at http://wolfire.com/lugaru.html
(the download link there has the same
filename as before, but it works now).
2.5.0 is now available for both Mac OS X and Linux: http://icculus.org/news/news.php?id=2518
"Only someone who'd never been an animal would put up a sign saying
not to feed them."