These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.91 s (backtrack: 0/20).


The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by games-action/prismlauncher-11.1.1::gentoo
# required by =games-action/prismlauncher-11.1.1 (argument)
>=dev-qt/qtbase-6.11.2-r2 vulkan

!!! The ebuild selected to satisfy "games-util/gamemode" has unmet requirements.
- games-util/gamemode-1.8.2::gentoo USE="-elogind (-systemd)"

  The following REQUIRED_USE flag constraints are unsatisfied:
    exactly-one-of ( systemd elogind )

(dependency required by "games-action/prismlauncher-11.1.1::gentoo" [ebuild])
(dependency required by "=games-action/prismlauncher-11.1.1" [argument])