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There was a very very VERY early (but working) AmigaOS4 port by me, still available on Aminet and OS4Depot. That version should be able to compile a 2.2.2 release compiler, which should be able to compile current 2.3.1 sources. But OS4 support is even more limited than MOS support. Basically nothing works, except what's really needed to run the compiler itself.

I started to add OS4 and MOS support to fd2pragma, to ease the conversion of header files from the C SDK, but that support never got fully finished, again, due to lack of time. (However, for example SDL support was done with it, on MOS.)