Install (Gentoo)
Install source
Fcitx has been in Gentoo portage tree for a long time. You can install it using emerge.
# emerge -av fcitx
It is strongly recommended to add the gtk, gtk3, qt USE flags in order to build the corresponding im modules.
# USE="gtk gtk3 qt4" emerge -av fcitx
Or you can add the USE flags in /etc/portage/package.use and then install it. (recommended)
app-i18n/fcitx gtk gtk3 qt4