I need #PureDarwin for macOS 13, just enough to run #Nix on it. The purpose: Build (hydra) server for Nix/macOS derivations.

Sadly, the latest preliminary release of PureDarwin and the PureDarwin Nano distribution (just drops into a shell) are for macOS 9.

I wonder how much work it would be to bring a nano system up-to-date. There isn't *that much* in there, and Nix/macOS is just a few bits short of an OS as it is.