@bianjp I think the libidn is already updated, below is ouput of "pacman -Qs libidn" and there was no prompt for libidn update (my os is manjaro):
local/libidn 1.34-2
Implementation of the Stringprep, Punycode and IDNA specifications
local/libidn2 2.0.5-1
Free software implementation of IDNA2008, Punycode and TR46
Pinned Comments
bianjp commented on 2016-10-13 02:37 (UTC) (edited on 2018-01-05 14:59 (UTC) by bianjp)
Gnome 3.22 changes the default backend to Wayland but fcitx does not fully support wayland yet. Switch to "Gnome on xorg" if fcitx-sogou does not work.
Unable to start? Try rm -rf ~/.sogouinput
Still not working? Try rm -rf ~/.sogouinput ~/.config/SogouPY* and re-login.