Bug#972394: likely cause: Python.h not found because of version mismatch 3.8 vs 3.9

[Joachim Wuttke]

Markus:

Further investigation shows that the problem is not with NumPy.
CMake not even finds Python.h.

The problem is most likely a mixture of Python 3.8 and 3.9 files on your system.

Try to uninstall libpython3-dev, which still depends on 3.8.

Good luck, Joachim

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