# Building documentation raises error 'no module named sage_autodoc'

I am trying to figure out how to get sphinx to build documentation for a package. I have tried several sample packages from github and always get the same error, so it must be a problem in my personal installation.

For instance, following the instructions to build documentation of these packages:

- github.com/sagemath/sage_sample/tree/master
- github.com/mmasdeu/sage_package_template/tree/master
- github.com/BlackHolePerturbationToolkit/kerrgeodesic_gw/tree/master

I'm eventually asked to run

```
$ make doc
```

on the main folder of the package, to which I get

```
sphinx-build -b html -d build/doctrees source build/html
Running Sphinx v4.3.2
Extension error:
Could not import extension sage_autodoc (exception: No module named 'sage_autodoc')
make: *** [Makefile:53: html] Error 2
```

I have SageMath version 9.5, Release Date: 2022-01-30, using Python 3.10.12. I have checked that there is indeed a module called sage_autodoc in my local installation, in the file `sage_docbuild/ext/sage_autodoc.py`

.
For some reason, sage is not acknowledging it. Does anyone know how to solve this?

Just a guess: if you run

`sage --buildsh`

first, that will start a new shell with various environment variables set, and those variables might help Python/Sphinx find the appropriate modules. You could try`sage --buildsh -c "make doc"`

.I do run

`make doc`

within`sage -sh`

for building the documentation of my packageI have cloned your package (slabbe) and tried

`make doc`

as well as`sage --buildsh -c "make doc"`

. Both times the error still persists, but is different:`Extension error: Could not import extension sage_autodoc (exception: cannot import name 'RemovedInSphinx80Warning' from 'sphinx.deprecation' (/usr/lib/python3/dist-packages/sphinx/deprecation.py))`

Maybe version 4.3.2 of Sphinx is too old and you need to upgrade?

Or maybe the Sphinx installed within SageMath 9.5 is not built with optional extensions like

`sage_autodoc`

? Is this the sagemath-9.5 available on Debian?