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

Calculating dependencies ... done!
Dependency resolution took 0.95 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "<dev-games/mygui-3.5.0:=" has unmet requirements.
- dev-games/mygui-3.4.3::gentoo USE="ogre opengl -debug -doc -plugins -samples -static-libs -test -tools" L10N="-ru"

  The following REQUIRED_USE flag constraints are unsatisfied:
    ogre? ( !opengl ) opengl? ( !ogre )

(dependency required by "games-engines/openmw-0.51.0::gentoo" [ebuild])
(dependency required by "=games-engines/openmw-0.51.0" [argument])