python312-sphinx missing extension failures (was Updated: python 3.9/3.12 packages)

[Marco Atzeri]

On 14/09/2026 08:26, Brian Inglis via Cygwin-apps wrote:
> On 2026-01-22 13:13, Marco Atzeri via Cygwin wrote:
>> On 22/01/2026 15:21, Jon Turney via Cygwin wrote:
>>> On 30/12/2025 11:19, Marco Atzeri via Cygwin-announce wrote:

> 
> Hi folks,
> 
> ITA jansson, build fails due to sphinx issue:
> 
> 
> $ tail jansson-2.15.1-1.x86_64/log/jansson-2.15.1-1-compile.log
> sphinx-build -b html -d _build/doctrees /usr/src/jansson/ 
> jansson-2.15.1-1.x86_64/src/jansson-2.15.1/doc _build/html
> Running Sphinx v7.4.7
> loading translations [en]... done
> 
> Extension error:
> Could not import extension sphinx.builders.changes (exception: No module 
> named 'tomli')
> make[1]: *** [Makefile:461: html-local] Error 2
> make[1]: Leaving directory '/usr/src/jansson/jansson-2.15.1-1.x86_64/ 
> build/doc'
> make: *** [Makefile:654: html-recursive] Error 1
> *** ERROR: make failed

If you build only for python 312 does it work ?


$ cygcheck -cd |grep sphinx
python312-sphinx                           9.1.0-1
python312-sphinx-notfound-page             1.1.0-1
python312-sphinx_rtd_theme                 3.1.0-1
python312-sphinxcontrib-applehelp          2.0.0-1
python312-sphinxcontrib-devhelp            2.0.0-1
python312-sphinxcontrib-htmlhelp           2.1.0-1
python312-sphinxcontrib-jsmath             1.0.1-3
python312-sphinxcontrib-qthelp             2.0.0-1
python312-sphinxcontrib-serializinghtml    2.0.0-1
python312-sphinxcontrib-websupport         2.0.0-1

python39-sphinx                            7.4.7-1
python39-sphinx-copybutton                 0.5.2-1
python39-sphinx-notfound-page              1.1.0-1
python39-sphinx_rtd_theme                  3.1.0-1
python39-sphinxcontrib-applehelp           2.0.0-1
python39-sphinxcontrib-devhelp             2.0.0-1
python39-sphinxcontrib-htmlhelp            2.1.0-1
python39-sphinxcontrib-jsmath              1.0.1-3
python39-sphinxcontrib-qthelp              2.0.0-1
python39-sphinxcontrib-serializinghtml     2.0.0-1
python39-sphinxcontrib-websupport          2.0.0-1




> Needs ChangesBuilders and HTMLBuilders - similar split dependency cause?
> 
> Looks like latest update just upgraded python39-sphinx... to 7.4.7 
> rather than replacing with python312-sphinx 9.1.0.

9.1.0 for 3.12
7.4.7 for 3.9 (it was the last before the limit of >=3.10 that most 
package now have)
> Can I encourage this with some setup or cygport b-r tweak(s)?
> 
> Meanwhile I will add explicit python312-sphinx b-r and see if that works?
> 
> Locally I will have to update-alternatives as:
> $ file /etc/alternatives/sphinx-build
> /etc/alternatives/sphinx-build: symbolic link to /usr/bin/sphinx-build-3.9
> 
> $ alternatives --config sphinx-build
> 
> There is 2 program that provides 'sphinx-build'.
> 
>    Selection    Command
> -----------------------------------------------
>   + 1           /usr/bin/sphinx-build-3.9
> *  2           /usr/bin/sphinx-build-3.12
> 
> Enter to keep the current selection[+], or type selection number: 2
> $ alternatives --display sphinx-build
> sphinx-build - status is manual.
>   link currently points to /usr/bin/sphinx-build-3.12
> /usr/bin/sphinx-build-3.9 - priority 39
> /usr/bin/sphinx-build-3.12 - priority 312
> Current `best' version is /usr/bin/sphinx-build-3.12.
> 
> Rerunning thru the failures due to missing extensions:
> 
> ...alabaster
> 
> Installed python3-alabaster python312-alabaster and also below and added 
> to b-r:
> 
> ...sphinxcontrib.applehelp!
> ...sphinxcontrib.htmlhelp
> ...sphinxcontrib.serializinghtml
> ...sphinxcontrib.qthelp
> 
> Should they be added to sphinx-build or other sphinx-... package requires?
> 
> Maybe we need a virtual sphinx package to install all required?
> 

There should be a circular dependency and all the
python312-sphinxcontrib-xxx packages should be
installed together at python312-sphinx

I will look of the dependency

Regards
Marco