* gnu/packages/patches/gdm-wayland-session-wrapper-from-env.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gnome.scm (gdm): Use it.
* gnu/services/xorg.scm (<gdm-configuration>)[wayland-session]: New field.
(gdm-wayland-session-wrapper): New procedure.
(gdm-configuration-file): Point to this new procedure.
* doc/guix.texi (X Window): Update it.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
