grab a copy of Metrowerks Pro 6.0.... and Mac OS no newer than 10.4 Tiger. You can run it in classic mode...you can also copy the compiler tools into Metrowerks Codewarrior Pro 7.0 from what I understand and use that.
Also the guy developing Browsy for system 6 is looking into using Retro64 Gcc from Linux... probably builds on Mac as well there are limitations to that however that have been brought up.
If you want to develop on a 68k mac you'll be in for a long wait to hunt down Metroworks Pro 4 its nearly unobtainuim. (I still haven't gotten a copy of it and I've been looking for awhile)
Also the guy developing Browsy for system 6 is looking into using Retro64 Gcc from Linux... probably builds on Mac as well there are limitations to that however that have been brought up.
If you want to develop on a 68k mac you'll be in for a long wait to hunt down Metroworks Pro 4 its nearly unobtainuim. (I still haven't gotten a copy of it and I've been looking for awhile)