Went and bought AmigaOS 4.1 FE Classic the other day and I just got one of the MUIClass test programs compiled on an emulated A4000PPC running AmigaOS 4.1 FE Classic
Some day I'll get a proper Amiga NG machine but for now this will let me play around.
I did none of the hard work with this, I grabbed the pre-created IDE package by ALB as well as the MUIClass source, copied into the virtual machine and after a couple of OOM errors while compiling the entire MUIClass package, it worked!