Packages with the xkb use flag

app-i18n / fcitx : Fcitx (Flexible Context-aware Input Tool with eXtension) input method framework

  • Enable support for XKB (required for fcitx-xkb, fcitx-xkbdbus, part of fcitx-keyboard)

sys-apps / systemd : System and service manager for Linux

  • Depend on x11-libs/libxkbcommon to allow logind to control the X11 keymap

x11-libs / libxcb : X C-language Bindings library

  • Enable the XCB keyboard extension