[Debian-astro-maintainers] Bug#919967: ndcube FTBFS: There is a programable error in your configuration file:

[Adrian Bunk]

Source: ndcube
Version: 1.0.1-2
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ndcube.html

...
Running Sphinx v1.7.9
/usr/lib/python3/dist-packages/astropy_helpers/sphinx/conf.py:5: UserWarning: Note that astropy_helpers.sphinx.conf is deprecated - use sphinx_astropy.conf instead
  warnings.warn("Note that astropy_helpers.sphinx.conf is deprecated - use sphinx_astropy.conf instead")

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

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/sphinx/config.py", line 161, in __init__
    execfile_(filename, config)
  File "/usr/lib/python3/dist-packages/sphinx/util/pycompat.py", line 150, in execfile_
    exec_(code, _globals)
  File "conf.py", line 143, in <module>
    extensions.remove('astropy_helpers.extern.numpydoc')
ValueError: list.remove(x): x not in list

make[1]: *** [debian/rules:18: override_dh_auto_build] Error 2