[KevinH]

Attached are my joint build instructions for Tk and Python-3.9.8 to make a fully relocatable python for Sigil. You should be able to use HomeBrew to grab all of the dependency libraries and can ignore the 10.12 build target and the python-3.9.8 build patch since you will be building a release for either Monterray or Big Sir as your target. These will need to be adapted for arm64 but these should help (he said hopefully).

You may also want to use Homebrew to get Tk 8.6.12 (which should have the required Monterray patches already in place) and then skip building an internal one (more like the Python-3.8 instructions) and rely on an external one installed by Homebrew.