User lauland on M9L's sister page System 7 Today has undertaken the project to port SDL 2 to Mac OS 9. He aims to make the journey as transparent as possible to learning / documenting purposes and hopes that other developers will join in. Progress can be seen in the respective forum thread.

Regular users are also invited to help by finding good candidates for ports. We're crossing fingers - SDL2 on MacOS 9 would open up a lot of new possibilites, including things like an up-to-date ScummVM.