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# Using GTK with Wayland {#gtk-wayland}
The GDK Wayland backend provides support for running GTK applications
under a Wayland compositor. To run your application in this way, select
the Wayland backend by setting `GDK_BACKEND=wayland`.
On UNIX, the Wayland backend is enabled by default, so you don't need to
do anything special when compiling it, and everything should "just work."
## Wayland-specific environment variables {#wayland-envar}
### WAYLAND_DISPLAY
Specifies the name of the Wayland display to use. Typically, wayland-0
or wayland-1.
### XDG_RUNTIME_DIR
Used to locate the Wayland socket to use.
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