X Window System

The X Library allows the input of characters that are not available on the keyboard by combining a sequence of key strokes. The mapping of these sequences is defined through Compose files. The Compose file is located in the /usr/share/X11/locale/$LANG/ directory, where $LANG is the language of the system.

If the combination of ’ and the letter ‘c’ is producing ‘ć’ instead of ‘ç’, you can run the following command to update the Compose file:

sudo sed -i /usr/share/X11/locale/en_US.UTF-8/Compose -e 's/ć/ç/g' -e 's/Ć/Ç/g'

Set the GTK and QT Input Method Modules

The GTK and QT libraries have their own input method modules that can be set to use the cedilla input method. To set the GTK and QT input method modules, add the following lines to the /etc/environment file:

GTK_IM_MODULE=cedilla
QT_IM_MODULE=cedilla