New comment by dkwo on void-packages repository

https://github.com/void-linux/void-packages/pull/34030#issuecomment-967508279

Comment:
About the doctests, I'm still unable to perform them
From within sage
```
sage: run_doctests(sage.combinat.affine_permutation)
too few successful tests, not using stored timings
Running doctests with ID 2021-11-12-21-34-16-32069d04.
Using --optional=sage
Doctesting 1 file.
sage -t --random-seed=0 /builddir/sage-9.5.beta5/src/sage/combinat/affine_permutation.py
    FileNotFoundError in doctesting framework
**********************************************************************
Traceback (most recent call last):
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/forker.py", line 2465, in __call__
    doctests, extras = self._run(runner, options, results)
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/forker.py", line 2513, in _run
    doctests, extras = self.source.create_doctests(sage_namespace)
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/sources.py", line 725, in create_doctests
    raise IOError(errno.ENOENT, "File does not exist", self.path)
FileNotFoundError: [Errno 2] File does not exist: '/builddir/sage-9.5.beta5/src/sage/combinat/affine_permutation.py'

----------------------------------------------------------------------
sage -t --random-seed=0 /builddir/sage-9.5.beta5/src/sage/combinat/affine_permutation.py  # FileNotFoundError in doctesting framework
----------------------------------------------------------------------
Total time for all tests: 0.0 seconds
    cpu time: 0.0 seconds
    cumulative wall time: 0.0 seconds
```
From terminal
```
[nicolo@mabragor ~]$ sage --testall
/usr/lib/sage-9.5.beta5/bin/sage-env: line 122: cd: /builddir/sage-9.5.beta5: No such file or directory
Warning: overwriting SAGE_ROOT environment variable:
Old SAGE_ROOT=/builddir/sage-9.5.beta5
New SAGE_ROOT=
Running doctests with ID 2021-11-12-21-36-43-b1335b9b.
Using --optional=dochtml,pip,sage,sage.geometry.polyhedron,sage.rings.real_double
Doctesting entire Sage library.
Traceback (most recent call last):
  File "/usr/lib/sage-9.5.beta5/bin/sage-runtests", line 151, in <module>
    err = DC.run()
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/control.py", line 1251, in run
    self.expand_files_into_sources()
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/control.py", line 835, in expand_files_into_sources
    self.sources = [FileDocTestSource(path, self.options) for path in expand()]
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/control.py", line 835, in <listcomp>
    self.sources = [FileDocTestSource(path, self.options) for path in expand()]
  File "/usr/lib/sage-9.5.beta5/lib/python3.9/site-packages/sage/doctest/sources.py", line 527, in __init__
    raise ValueError("unknown file extension %r"%ext)
ValueError: unknown file extension ''
```
What am I missing?