On Thu, 9 Jan 2020 15:18:55 +0100
Victor Stinner <vstin...@python.org> wrote:

> Which build command rely on python-config? Is it to cross-compile 3rd
> party C extensions on the host?

Hello, OP speaking here. In two cases I came across this issue. No
cross-compiling involved.

1) To debug a Python C extension I wrote a standalone C test
program which of course needs to find "Python.h" and libpython*.* for
building. I ran into trouble when I tried to build that program in a
custom compiled debugging Python environment.

2) I need to recheck this, but it was a "pip install" for a package
from pypi org. Probably numpy or pandas errored out with not being able
to find "Python.h". I'll try and re-check.
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