Guido van Rossum <gu...@python.org> added the comment:

This is expected -- those modules contain C extensions for which no 3.10 wheels 
are available from PyPI yet, so pip tries to build them locally.

If you want to help testing, please install the recommended free version of the 
MS C++ compiler.  From CPython/PCbuild/readme.txt:

1.  Install Microsoft Visual Studio 2017 with Python workload and
    Python native development component.

----------
nosy: +gvanrossum
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42845>
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