Install uil by entering the following commands in the terminal:
sudo apt update sudo apt install uil
Description:
Motif - UIL (User Interface Language) compiler
Motif is the industry standard GUI component toolkit for *NIX. . This package contains uil, the User Interface Language compiler.
Homepage: http://motif.ics.com/
Version: 2.3.8-2build1
Section: universe/devel