If you are interested in programming for AROS, the best way right now is to use Linux. AROS cannot compile within it's self. You should use gcc3 and not gcc4, because it is not supported yet. So if you want to use the new Fedora Core 4 Linux distro. It comes with gcc4, so it isn't a good idea at this time. BSD flavors can also be used, for example FreeBSD, OpenBSD and NetBSD. I don't know of anyone that is using DragonFly yet. Actually, the head developer at Dragonfly BSD (Matthew Dillon) wrote the famous Dice C compiler for the Amiga years ago. Some of the Linux distros being used are Debian, Ubuntu, Fedora Core 3 and Suse.