[PySide] Wins amd64, linking QtGui hangs in _winapi_WaitForSingleObject

[Kacvinsky, Tom]

I am having a problem building PySide2 (based on Qt 5.15.2 + Python 3.9.2) in which
there is a hang when linking the QtGui pyd file.  Pressing Crtl-C leads to a back trace
in the subprocess module in _winapi.WaitForSingleObject.  This happens regardless
of running with --parallel (=9 in my case) or without --paralle.  Any ideas?  I can't
see why linking QtGui would hang when linking any of the other PySide pyd files does
not hang.  Is it just that linking QtGui takes a long time?

Thanks,

Tom
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