Install cl-unicode by entering the following commands in the terminal:
sudo apt update sudo apt install cl-unicode
Description:
portable Unicode library for Common Lisp
CL-UNICODE is a library which provides Common Lisp implementations with knowledge about Unicode characters including their name, their general category, the scripts and blocks they belong to, their numerical value, and several other properties. It also provides the ability to replace the standard syntax for reading Lisp characters with one that is Unicode-aware and is used to enhance CL-PPCRE with Unicode properties. . CL-UNICODE is based on Unicode 5.1.
Homepage: http://weitz.de/cl-unicode/
Version: 0.1.5-3
Section: universe/lisp