gnucash

Administrator privs on your Mac.
Project admin privs for https://sourceforge.net/projects/gnucash.
Jhbuild doesn't cross-compile well so you need a mac with the same architecture as the github VM. Check here for the current configuration. At the time of this writing it's x86_64.
Xcode or command-line tools (install the latter with sudo xcode-select -install). To build this tarball you must be running the same or newer macOS version as the Github VM.

Procedure:

Set up a Gtk-OSX build environment following the GnuCash Quartz Build instructions.
Retrieve jhbuildrc-custom and put it in ~/.config.
Set modules = _modules_deps on the appropriate line of jhbuildrc-custom.
If you are running a newer version of macOS than the Github actions virtual environment change the setup_SDK() line at the bottom of jhbuildrc-custom to setup_SDK('11'), substituting the VM's macOS version for '11'.
Create the directory /Users/runner/ and make yourself the owner:
```
sudo mkdir /Users/runner
sudo chown me /Users/runner
mkdir /Users/runner/gnucash
```
Substituting your own userid for 'me'.
Run util/ci/macos-ci-deps/make-macos-deps-tarball.sh gnucash-4.2-mac-dependencies.tar.xz from the root of the source directory, changing the tarball's name if appropriate.
Upload the resulting tarball to the Dependencies folder in the Gnucash files section on SourceForge.
If necessary modify `.github/workflows/mac-tests.yaml to reflect the tarball's URI.