Dear mlterm developers, I am the current co-maintainer of fcitx in Debian. The latest version of fcitx (4.2.9.5, released on 2017-11-09) seems to have broken mlterm's fcitx support due to a library SONAME bump in libfcitx-gclient. Some functions you're using in mlterm is gone (moved away from header file).
This bug has been submitted downstream in Debian: https://bugs.debian.org/887711 Please help investigate into this problem and fix it if possible. Regards, Boyuan Yang