Install libcegui-mk2-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libcegui-mk2-doc
Description:
Crazy Eddie's GUI (documentation)
CEGUI is a free library providing windowing and widgets for graphics APIs and engines where such functionality is not natively available or is severely lacking. The library is written in C++, is object oriented, and is primarily targeted at games developers who should be spending their time creating great games, not building GUI sub-systems . This package contains the documentation, and example files for CEGUI.
Homepage: http://www.cegui.org.uk/
Version: 0.8.7-2
Section: universe/doc