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# Mercurial's Contributing guidelines
Our full contribution guidelines are in our wiki, please see:
<https://www.mercurial-scm.org/wiki/ContributingChanges>
If you just want a checklist to follow, you can go straight to
<https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist>
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).
## Development dependencies
### Required dependencies
- Python (see `project.requires-python` in `pyproject.toml`) with `venv` and `pip`
- `make` with few other standard Unix tools (`diff`, `grep`, `unzip`, `gunzip`, `bunzip2` and `sed`)
For Windows, see `contrib/install-windows-dependencies.ps1`.
### Optional dependencies
- Mercurial contributors should install a quite recent Mercurial with the
extensions `evolve` and `topic` activated.
- A C compiler and Python headers (typically Debian package `python3-dev`
or Microsoft Build Tools for Visual Studio on Windows)
- `msgfmt` from the Debian package `gettext` (used to build the translations)
- [Rust tools](https://www.rust-lang.org/tools/install) (see `rust/README.md`)
#### Note on installation
Mercurial is a Python application that can be installed with
[pipx](https://pipx.pypa.io) and `uv tool`. UV is a Rust application that can also be
installed with pipx or with
[its own installer](https://docs.astral.sh/uv/getting-started/installation/).
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