2020-03-19 update:
GTK+ dropped the + and their website has been rewritten. So the install instructions for GTK on Windows are now at https://www.gtk.org/docs/installations/windows/
2017-04-07 update:
To make it clear, since 2017-06-23, the GTK+ project doesn't provide binary bundles for Windows. These are now provided by the MSYS2 project, with the blessing of the GTK+ team.
MSYS2 provides the most up-to-date versions of GTK+ for Windows, as well as a complete toolchain, and other useful GTK-related development tools like:
- Glade, the GUI designer
- Devhelp, the offline documentation browser
The official GTK+ website contains GTK+ installation instructions for Windows.
2013-10-27 update:
There's now an officially supported version of GTK 3 for Windows (GTK 3.6.4 as of today). You'll find it on the official GTK+ website, in the Downloads section.
Thanks to the GTK team, and to tarnyko for his work in this regard.
2013-02-01 update:
There's a French dude (tarnyko) providing an (unofficial) GTK 3 installer for Windows, based on the OpenSUSE binaries, and another guy providing another (unofficial, again) build. Might help. The gtk-list mailing list is the best place to check how this evolves through time.
Original content:
There is currently no installer for GTK3 on Windows. However, the OpenSUSE Build System provides the Windows binaries for GTK3. On a GTK3 on Windows thread of the GTK devel mailing list, Maarten Bosmans provided the download-mingw-rpm.py python script, which automates the download of a package and its dependencies, and then uses 7-zip to unzip the content of the packages. See the post he explains how to use download-mingw-rpm.py.
