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So, with the patch - the process stops at:
aixtools@x064:[/home/aixtools/python-3.9]make
 CC='xlc_r' LDSHARED='Modules/ld_so_aix xlc_r -bI:Modules/python.exp ' OPT='-DNDEBUG -O' _TCLTK_INCLUDES='' _TCLTK_LIBS='' ./python -E ./setup.py build
Traceback (most recent call last):
 File "/home/aixtools/python-3.9/Lib/subprocess.py", line 72, in <module>
 import msvcrt
ModuleNotFoundError: No module named 'msvcrt'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/home/aixtools/python-3.9/./setup.py", line 4, in <module>
 import subprocess
 File "/home/aixtools/python-3.9/Lib/subprocess.py", line 77, in <module>
 import _posixsubprocess
ModuleNotFoundError: No module named '_posixsubprocess'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/home/aixtools/python-3.9/./setup.py", line 16, in <module>
 sys.modules['subprocess'] = _bootsubprocess
NameError: name 'sys' is not defined
make: 1254-004 The error code from the last command is 1.
Stop.