# Setting up Nominatim for Development
-This chapter gives an overview how to set up Nominatim for developement
+This chapter gives an overview how to set up Nominatim for development
and how to run tests.
!!! Important
* [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer)
* [Pylint](https://pylint.org/) (CI always runs the latest version from pip)
* [mypy](http://mypy-lang.org/) (plus typing information for external libs)
+* [Python Typing Extensions](https://github.com/python/typing_extensions) (for Python < 3.9)
* [pytest](https://pytest.org)
The documentation is built with mkdocs:
* [mkdocs](https://www.mkdocs.org/) >= 1.1.2
-* [mkdocstrings](https://mkdocstrings.github.io/)
+* [mkdocstrings](https://mkdocstrings.github.io/) >= 0.16
+* [mkdocstrings-python-legacy](https://mkdocstrings.github.io/python-legacy/)
### Installing prerequisites on Ubuntu/Debian
sudo apt install php-cgi phpunit php-codesniffer \
python3-pip python3-setuptools python3-dev
-pip3 install --user behave mkdocs mkdocstrings pytest \
- pylint mypy types-PyYAML types-jinja2
+pip3 install --user behave mkdocs mkdocstrings pytest pylint \
+ mypy types-PyYAML types-jinja2 types-psycopg2 types-psutil
```
The `mkdocs` executable will be located in `.local/bin`. You may have to add