Ah alright, some of those macOS specific problems had been fixed a little while ago when work on the macOS parts of the zld linker happened. I still get an occasional "framework headers not found" on macOS in the current Zig head version, but after the first failure I never seem to be able to reproduce it. It also never happens when running in CI, so I'm not sure if it isn't actually a problem with my Xcode setup.