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

Calculating dependencies ...

!!! Problem resolving dependencies for =kde-plasma/plasma-meta-6.6.6-r1
 done!
Dependency resolution took 0.83 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "=kde-plasma/plasma-meta-6.6.6-r1" has unmet requirements.
- kde-plasma/plasma-meta-6.6.6-r1::gentoo USE="X browser-integration crash-handler crypt display-manager kwallet networkmanager sddm smart wallpapers xwayland -accessibility -bluetooth -cups -discover -elogind (-firewall) -flatpak -grub -gtk -ocr -oxygen-theme -plymouth -pulseaudio -rdp -sdk (-systemd) -thunderbolt -unsupported -virtualkeyboard -wacom -webengine"

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

  The above constraints are a subset of the following complete expression:
    exactly-one-of ( elogind systemd ) firewall? ( systemd )