Hi Markus, I confirm that this is a serious issue.
I got the same error message
Could NOT find Python3 (missing: Python3_INCLUDE_DIRS Python3_LIBRARIES
Development NumPy Development.Module Development.Embed) (found version
"3.9.0")
in a completely different software project after I dist-upgraded my Debian/
testing system. That upgrade did not affect my cmake, which I compile
myself (version 3.18.20200714-g2da7786-dirty). However, the upgrade did
change numerous Python3 packages, among them
python3-numpy:amd64 (1:1.19.1-1, 1:1.19.2-2+b1)
but not python3-dev. So my guess is the problem is a change in python3-numpy
that breaks CMake's
find_package(Python3 COMPONENTS Development NumPy)
command.
Accordingly, I will report the bug to python3-numpy.
Regards, Joachim
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