[Python-modules-team] Bug#907381: python-sphinx: missing dependency on python-stemmer

[Adrian Bunk]

Package: python-sphinx
Version: 1.7.7-1
Severity: serious
Control: affects -1 src:bzr

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/arm64/bzr.html

...
sphinx-build -b html -d _build/doctrees   . _build/html
Running Sphinx v1.7.7
loading translations [es]... done
loading pickled environment... not yet created
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 6 source files that are out of date
updating environment: 6 added, 0 changed, 0 removed
reading sources... [ 16%] index
reading sources... [ 33%] mini-tutorial/index
reading sources... [ 50%] quick-reference/index
reading sources... [ 66%] user-guide/index
reading sources... [ 83%] user-guide/index-plain
reading sources... [100%] user-guide/version_info

looking for now-outdated files... none found
pickling environment... done
checking consistency... /build/1st/bzr-2.7.0+bzr6622/doc/es/user-guide/index-plain.txt: WARNING: document isn't included in any toctree
done
preparing documents... 
Exception occurred:
  File "/usr/lib/python2.7/dist-packages/sphinx/search/es.py", line 14, in <module>
    import Stemmer
ImportError: No module named Stemmer
The full traceback has been saved in /tmp/sphinx-err-Y1IJ0z.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
make[3]: *** [Makefile:50: html] Error 2


python3-sphinx likely has a similar problem.