/usr/lib/python3.10/site-packages/setuptools/dist.py:717: UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead
  warnings.warn(
running build
running build_py
creating build
creating build/lib
creating build/lib/commonmark
copying commonmark/node.py -> build/lib/commonmark
copying commonmark/blocks.py -> build/lib/commonmark
copying commonmark/__init__.py -> build/lib/commonmark
copying commonmark/normalize_reference.py -> build/lib/commonmark
copying commonmark/entitytrans.py -> build/lib/commonmark
copying commonmark/cmark.py -> build/lib/commonmark
copying commonmark/common.py -> build/lib/commonmark
copying commonmark/main.py -> build/lib/commonmark
copying commonmark/dump.py -> build/lib/commonmark
copying commonmark/inlines.py -> build/lib/commonmark
creating build/lib/commonmark/render
copying commonmark/render/__init__.py -> build/lib/commonmark/render
copying commonmark/render/renderer.py -> build/lib/commonmark/render
copying commonmark/render/rst.py -> build/lib/commonmark/render
copying commonmark/render/html.py -> build/lib/commonmark/render
creating build/lib/commonmark/tests
copying commonmark/tests/run_spec_tests.py -> build/lib/commonmark/tests
copying commonmark/tests/__init__.py -> build/lib/commonmark/tests
copying commonmark/tests/rst_tests.py -> build/lib/commonmark/tests
copying commonmark/tests/unit_tests.py -> build/lib/commonmark/tests
make: Entering directory '/build/python-commonmark/src/commonmark.py-0.9.1/docs'
sphinx-build -b man -d _build/doctrees   . _build/man
Running Sphinx v4.3.2

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/sphinx/config.py", line 329, in eval_config_file
    exec(code, namespace)
  File "/build/python-commonmark/src/commonmark.py-0.9.1/docs/conf.py", line 142, in <module>
    import sphinx_rtd_theme
ModuleNotFoundError: No module named 'sphinx_rtd_theme'

make: *** [Makefile:141: man] Error 2
make: Leaving directory '/build/python-commonmark/src/commonmark.py-0.9.1/docs'
==> ERROR: A failure occurred in build().
    Aborting...