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

Calculating dependencies ... done!
Dependency resolution took 0.84 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-puzzle/wizznic-400::gentoo
# required by =games-puzzle/wizznic-400 (argument)
>=media-libs/sdl-mixer-1.2.12_p20260511 vorbis

!!! The ebuild selected to satisfy "media-libs/sdl-mixer[vorbis]" has unmet requirements.
- media-libs/sdl-mixer-1.2.12_p20260511::gentoo USE="fluidsynth midi mod modplug mp3 wav -flac -mad -mikmod -playtools -smpeg -static-libs -timidity -vorbis"

  The following REQUIRED_USE flag constraints are unsatisfied:
    mp3? ( any-of ( smpeg mad ) )

  The above constraints are a subset of the following complete expression:
    midi? ( any-of ( fluidsynth timidity ) ) timidity? ( midi ) fluidsynth? ( midi ) mp3? ( any-of ( smpeg mad ) ) smpeg? ( mp3 ) mad? ( mp3 ) mod? ( any-of ( mikmod modplug ) ) mikmod? ( mod ) modplug? ( mod )

(dependency required by "games-puzzle/wizznic-400::gentoo" [ebuild])
(dependency required by "=games-puzzle/wizznic-400" [argument])