Bug#955096: vitables: FTBFS with Sphinx 2.4: Sphinx error: Builder name qthelp not registered or available through entry point

[Lucas Nussbaum]

Source: vitables
Version: 3.0.0-1
Severity: important
Tags: ftbfs
User: python-modules-team at lists.alioth.debian.org
Usertags: sphinx2.4

Hi,

vitables fails to build with Sphinx 2.4, currently available in
experimental.

Relevant part (hopefully):
> make[2]: Entering directory '/<<PKGBUILDDIR>>/doc'
> sphinx-build -b qthelp -d _build/doctrees   . _build/qthelp
> Running Sphinx v2.4.3
> 
> Sphinx error:
> Builder name qthelp not registered or available through entry point
> make[2]: *** [Makefile:86: qthelp] Error 2

The full build log is available from:
   http://qa-logs.debian.net/2020/03/26/vitables_3.0.0-1_unstable_sphinx243.log

Please see [1] for Sphinx changelog, which may give a hint of what changes in
Sphinx caused this error.

Also see [2] for the list of deprecated/removed APIs and possible alternatives
to them.

Sphinx 2.4 is going to be uploaded to unstable in a couple of weeks. When that
happens, the severity of this bug will be bumped to serious.

In case you have questions, please Cc sphinx at packages.debian.org on reply.

[1]: https://www.sphinx-doc.org/en/2.0/changes.html
[2]: https://www.sphinx-doc.org/en/2.0/extdev/deprecated.html#dev-deprecated-apis

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.