extension-helpers

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The setup_helpers.pkg_config function is used in several of astropy's setup_package.py files, so we should keep it here, but it isn't tested or documented, so that will need to be fixed.

The function is simple enough, so I'm not sure if it is worth changing, but there is a python package wrapping pkg-config: https://github.com/matze/pkgconfig I saw it used by some package I don't remember. It is a single file so it could be bundled, which would also remove the need to test and document our version.

Oh interesting! Actually if we want to go down that road I suggest we just remove that from extension-helpers and have packages add pkgconfig to their pyproject.toml and use it directly. Is there any reason not to do that?

Oh yes indeed, that would be even simpler.

:+1: for removing everything we can :grinning:

I won't have time to investigate this in the near future, but if one of you has time to take a look, feel free to open a PR to astropy core to demonstrate how we could use the pkgconfig package instead!