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.”
Specifies the name of the Wayland display to use. Typically, wayland-0 or wayland-1.
Used to locate the Wayland socket to use.
© 2005–2020 The GNOME Project
Licensed under the GNU Lesser General Public License version 2.1 or later.
https://developer.gnome.org/gtk4/4.0/gtk-wayland.html