All of them are official packages in ArchLinux x64.
kodi-addon-game-libretro
kodi-addon-game-libretro-beetle-psx
kodi-addon-game-libretro-desmume
kodi-addon-game-libretro-gambatte
kodi-addon-game-libretro-melonds
kodi-addon-game-libretro-mgba
kodi-addon-game-libretro-mupen64plus
kodi-addon-game-libretro-nestopia
kodi-addon-game-libretro-parallel-n64
kodi-addon-game-libretro-reicast
kodi-addon-game-libretro-scummvm
kodi-addon-game-libretro-snes9x
kodi-addon-game-libretro-yabause