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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: How to build Python3 support into GNATCOLL with alire
Date: Mon, 21 Nov 2022 22:39:47 +0000
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Fabien Chouteau <fabien.chouteau@gmail.com> writes:

> We are considering adding the feature to Alire directly. In particular
> an easy way to get relevant info from pkg-config.

In the case of gnatcoll_python3, which already has
GNATCOLL_PYTHON_CFLAGS and GNATCOLL_PYTHON_LIBS environment vars, what
we need *for Homebrew* is to set the first to
  pkg-config --cflags-only-I python3-embed
and the second to
  pkg-config --libs-only-L python3-embed

Note the python3-embed! python3 on its own gives you no libs on
macOS. As far as I can tell this has been in Python since 3.8.

I did an experiment adding Homebrew to a new
gnatcoll_python3-23.0.1.toml and revised libpython3dev-external.toml,
and it successfully build a simple demo with the above environment
variables set externally.