gtk2/CONTRIBUTING.md

If you want to hack on the GTK+ project, you'll need to have the development tools appropriate for your operating system, including:

- Python (2.7 or 3.x)
- Meson
- Ninja
- Gettext (19.7 or newer)
- a C99 compatible compiler

Up-to-date instructions about developing GNOME applications and libraries can be found here:

    https://developer.gnome.org

Information about using git with GNOME can be found here:

    https://wiki.gnome.org/Git

In order to get Git GTK+ installed on your system, you need to have the required versions of all the GTK+ dependencies; typically, this means a recent version of GLib, Cairo, Pango, and ATK.

Note: if you plan to push changes to back to the master repository and have a GNOME account, you want to use the following instead:

$ git clone ssh://<username>@git.gnome.org/git/gtk+

To compile the Git version of GTK+ on your system, you will need to configure your build using Meson:

$ meson _builddir .

For information about submitting patches and pushing changes to Git, see the README.md and README.commits files. In particular, don't, under any circumstances, push anything to Git before reading and understanding README.commmits.