This game is written in Glulx, and so you'll need an interpreter to run it. There's a selection here:
http://www.ifarchive.org/indexes/if-archiveXprogrammingXglulxXinterpreters.html
I personally use Git, but I'm on a Windows machine. For Mac OS X, I recommend Zoom:
http://www.logicalshift.co.uk/unix/zoom/