You'll need to set up a Geek Gadgets environment, which is pretty difficult. I used the Geek Gadgets v2 CD (
http://ftp.back2roots.org/back2roots/cds/fred_fish/geekgadgets_vol2_9704/) a few years ago, but I can't remember what I did afterwards to make it a little more up-to-date. I was able to compile Duke Nukem (with the help of some folks here in finding the correct CGX includes to use) but I haven't tried much else.
Latest 68K SDL on Aminet is 1.2.6 which seems very old - not sure if there's something more recent elsewhere.
EDIT: I'm new to this, too
