Building against Python development build: Missing pyconfig.h

[Florian Bruhin]

Hi,

I've tried building CPython 3.10 from git, and then building the latest
PyQt5 snapshot against it.

That is:

    PyQt-builder 1.11.0.dev2107161131
    PyQt5-sip 12.9.0
    sip 6.2.0.dev2107131757
    PyQt5 5.15.5.dev2107091435

When I do so, I get:

    gcc [...] -DQT_PLUGIN -I. -I. -I.. -I[...]/cpython/Include -I[...]/qtbase/mkspecs/linux-g++ -o sipQtcmodule.o sipQtcmodule.c
    In file included from ../sip.h:24,
                     from sipQtcmodule.c:7:
    /home/florian/tmp/cpython/Include/Python.h:8:10: fatal error: pyconfig.h: No such file or directory
        8 | #include "pyconfig.h"
          |          ^~~~~~~~~~~~
    compilation terminated.

This seems to fail because the pyconfig.h in a Python built from sources
is actually in the cpython directory (i.e. the repository root, where
the 'python' executable is too) and not the Include directory.

After a "ln -s ../pyconfig.h" in the cpython/Include directory, the
build succeeded.

Florian

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