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What is GTK 3?
GTK, formerly known as the GIMP Toolkit, is a widget toolkit: developers use it to assemble graphical interfaces from components such as windows, buttons, menus and input controls, then respond to events such as clicks. GTK 3 is implemented in C and uses GObject for its object system. The GTK 3 reference describes the 3.24 library line and identifies gtk+-3.0 as its pkg-config module. GTK is licensed under LGPL-2.1-or-later. GTK 3 API reference
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For more complex interfaces, GTK’s getting-started guide recommends GtkBuilder and GTK-specific markup. Glade is another option for visually editing interface layouts. GTK 3 getting started
Which libraries does GTK 3 use?
The GTK 3 reference lists GObject, ATK, Pango and GDK among its dependencies. The wider GTK platform also includes libraries with related but distinct responsibilities; not every library in that ecosystem is a mandatory dependency of every GTK application.
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| Library | Role |
|---|---|
| GObject | Provides the object system used by GTK. |
| ATK | Accessibility toolkit listed among GTK 3’s dependencies. |
| GDK | Abstracts details of the window system. |
| Pango | Handles text layout and fonts. |
| GLib | Supplies core building blocks such as common types, the main loop and utility functions. |
| GdkPixbuf | Loads and manipulates images. |
| Cairo | Provides 2D graphics. |
These roles are summarized in the GTK documentation index; the GTK 3 reference names its direct dependency set separately.
Related libraries are optional for many apps
Libraries such as libadwaita, which adds widgets and GNOME design patterns, and WebKitGTK, which adds web features such as embedded web views, serve particular application needs. Their presence in the GNOME ecosystem does not mean every GTK 3 program requires them. GNOME libraries overview
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How to install GTK 3 libraries
On GNU/Linux and Unix-like systems, install the package matching your distribution. For compiling an application, choose the development package where one is listed; a runtime package alone may not include the headers and build metadata required for compilation. Package names can change between distribution releases, so verify them in your system’s package index.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches| Distribution | GTK 3 package names listed by GTK | Use |
|---|---|---|
| Arch Linux | gtk3 |
GTK 3 package; check the distribution package details for development contents. |
| Debian/Ubuntu | libgtk-3-0, libgtk-3-dev, gtk-3-examples |
libgtk-3-0 is the runtime; libgtk-3-dev is for development; examples are available separately. |
| Fedora | gtk3, gtk3-devel |
gtk3-devel is the development package. |
These names come from GTK’s GNU/Linux and Unix installation guide. Use your package manager’s usual install command with the package name for your distribution and release.
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Build an application, not the toolkit
Installing a development package and compiling an application against the installed GTK libraries are different tasks from building GTK itself from source. The GTK 3 reference separates instructions for compiling the toolkit, compiling applications and running applications. GTK 3 API reference
If you are building the toolkit from source, consult its GTK 3-specific build guidance rather than assuming instructions for the current main branch apply unchanged. The GTK repository README lists general development requirements including a C11-compatible compiler, Python 3, Meson and Ninja, plus platform-dependent dependencies; those requirements can evolve. GTK project repository
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Is GTK 3 still supported, and should you use GTK 4?
GTK’s installation documentation identifies GTK 3 as an older stable version and GTK 4 as the current stable API. At the time the GTK homepage was consulted for this article, it listed GTK 4.22.5 as latest stable, GTK 4.23.4 as latest unstable and GTK 3.24.52 as latest old stable. These are changing release labels, not a guarantee of a particular support period. GTK installation guide GTK Project
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GTK 3.x and GTK 4.x environments can be installed side by side, but they are distinct major versions. Choose the version required by the application or project: installing GTK 4 does not satisfy a GTK 3 dependency. GTK installation guide
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- Use GTK 3 when the application or its dependencies require GTK 3, or when its existing code and target systems make that the practical choice.
- Consider GTK 4 for new work when its APIs, required widgets and platform support meet the project’s needs.
- Before switching, check API and widget compatibility, migration effort, package availability on target systems, backend requirements and the maintenance state of the dependency stack.
The official sources establish which line is older and that both can coexist; they do not prescribe one universal choice for every project.
Can GTK 3 run on Windows or macOS?
The GTK 3 API documentation provides guidance for X11, Windows, Wayland, macOS and Broadway. That establishes documented platform and backend paths, but not identical support or behavior across every application and dependency combination. For a real deployment, verify the specific app, backend, available dependency packages and maintenance requirements on each target platform. GTK 3 API reference
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