A useful distribution (for building anyway) would require all the headers and binaries from macOS, which wouldn’t be distributable, right? So you’d have to have

A useful distribution (for building anyway) would require all the headers and binaries from macOS, which wouldn’t be distributable, right? So you’d have to have enough of a free system to be able to get to the point where that stuff could be slurped out of a legit macOS installation. Sounds like an interesting challenge.