Apple is now selling new macs with their own "M1" arm CPU. We will probably get a Mac Mini at work for building & testing the architecture. I also need a new machine and am considering getting a laptop with an M1.

In either case, I anticipate being able to make a macOS arm64 build of Pd for testing. With the build system we now have, I don't foresee any major issues... hopefully. I think updating pd-lib-builder should be similarly straightforward.