GTK is a multi-platform toolkit for creating graphical user interfaces.
Go to file
Timm Bäder 3a1e019e83 print-editor: Fix a wrong comparison
If error is NULL, replacing the file contents worked and we don't
show the error dialog. The previous version pretty explicitly
dereferenced a NULL pointer by first ensuring that error is NULL and
then accessing error->message.

Found by scan-build
2020-10-22 17:46:33 +02:00
.gitlab/issue_templates issue templates: reproducers should be written in C 2019-05-18 13:47:59 +02:00
.gitlab-ci Merge branch 'master' into 'matthiasc/for-master' 2020-10-01 13:56:37 +00:00
build-aux flatpak: builder options 2020-08-13 16:30:22 -04:00
demos print-editor: Fix a wrong comparison 2020-10-22 17:46:33 +02:00
docs linkbutton: Use the LINK role 2020-10-21 22:19:54 -04:00
examples Clean up uses of gtk_toggle_button_get/set_active 2020-08-30 21:23:25 -04:00
gdk macos: fix discovery of surface under pointer 2020-10-19 12:35:41 -07:00
gsk Add some missing nullable return annotations 2020-10-17 15:32:36 +02:00
gtk picture: Set alternative text as description 2020-10-22 07:51:44 -04:00
modules Merge branch 'master' into 'master' 2020-10-07 20:51:40 +00:00
po Update Croatian translation 2020-10-19 16:37:36 +00:00
po-properties Update POTFILES.in 2020-10-17 11:11:24 +02:00
subprojects Use gtk-doc from master 2020-10-01 15:11:37 -04:00
tests showrendernode: Plug GOptionContext memory leak 2020-10-14 15:06:12 -04:00
testsuite linkbutton: Use the LINK role 2020-10-21 22:19:54 -04:00
.clang-format ci: Add a style check pass 2020-02-11 14:47:22 +00:00
.gitignore .gitignore: Ignore all subdirs in the subprojects dir 2018-10-12 14:23:53 +05:30
.gitlab-ci.yml Use test AT context with installed tests 2020-10-12 16:19:31 +01:00
AUTHORS AUTHORS: some updates 2020-09-12 11:52:14 -04:00
config.h.meson Check for mlock() 2020-09-08 23:50:12 +01:00
CONTRIBUTING.md Update CONTRIBUTING.md 2020-05-06 15:08:36 -04:00
COPYING
gtk4-unix-print.pc.in Adjust some more pkg-config references for gtk+ to gtk rename 2019-02-06 09:56:08 +01:00
gtk4.pc.in gtk4.pc: Move third-party libraries from Libs to Libs.private 2019-07-18 09:24:41 +01:00
gtk.doap Rename project files 2019-02-06 10:42:50 +01:00
gtk.supp Better fontconfig suppression 2020-08-30 13:14:55 -04:00
lsan.supp Ignore more leaks in asan 2020-07-09 16:18:07 -04:00
make-pot *: Fix spelling mistakes found by codespell 2020-08-21 15:29:34 +02:00
make-release.sh Update the release script 2020-10-01 15:14:33 -04:00
meson_options.txt meson: Change introspection option to yielding feature 2020-09-30 15:11:27 -04:00
meson.build 3.99.3 2020-10-15 23:03:03 -04:00
NEWS 3.99.3 2020-10-15 23:03:03 -04:00
NEWS.pre-1.0 Split NEWS 2018-01-10 19:06:45 -05:00
NEWS.pre-2.0 Split NEWS 2018-01-10 19:06:45 -05:00
NEWS.pre-3.0 Split NEWS 2018-01-10 19:06:45 -05:00
README.md README: Cosmetics 2020-09-01 19:21:32 -04:00

GTK — The GTK toolkit

Build status

General information

GTK is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK is suitable for projects ranging from small one-off projects to complete application suites.

GTK is free software and part of the GNU Project. However, the licensing terms for GTK, the GNU LGPL, allow it to be used by all developers, including those developing proprietary software, without any license fees or royalties.

The official download location

The official web site

The official developers blog

Discussion forum

Nightly documentation can be found at

Building and installing

In order to build GTK you will need:

You will also need various dependencies, based on the platform you are building for:

If you are building the X11 backend, you will also need:

  • Xlib, and the following X extensions:
    • xrandr
    • xrender
    • xi
    • xext
    • xfixes
    • xcursor
    • xdamage
    • xcomposite

If you are building the Wayland backend, you will also need:

  • Wayland-client
  • Wayland-protocols
  • Wayland-cursor
  • Wayland-EGL

Once you have all the necessary dependencies, you can build GTK by using Meson:

$ meson _build .
$ cd _build
$ ninja

You can run the test suite using:

$ meson test

And, finally, you can install GTK using:

$ sudo ninja install

Complete information about installing GTK and related libraries can be found in the file:

docs/reference/gtk/html/gtk-building.html

Or online

How to report bugs

Bugs should be reported on the issues page.

In the bug report please include:

  • Information about your system. For instance:

    • which version of GTK you are using
    • what operating system and version
    • for Linux, which distribution
    • if you built GTK, the list of options used to configure the build

    And anything else you think is relevant.

  • How to reproduce the bug.

    If you can reproduce it with one of the demo applications that are built in the demos/ subdirectory, on one of the test programs that are built in the tests/ subdirectory, that will be most convenient. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.

  • If the bug was a crash, the exact text that was printed out when the crash occurred.

  • Further information such as stack traces may be useful, but is not necessary.

Contributing to GTK

Please, follow the contribution guide to know how to start contributing to GTK.

Release notes

The release notes for GTK are part of the migration guide in the API reference. See:

Licensing terms

GTK is released under the terms of the GNU Lesser General Public License, version 2.1 or, at your option, any later version, as published by the Free Software Foundation.

Please, see the COPYING file for further information.

GTK includes a small number of source files under the Apache license:

  • A fork of the roaring bitmaps implementation in gtk/roaring
  • An adaptation of timsort from python in gtk/timsort