Install libopentoken6.1-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libopentoken6.1-dev
OpenToken lexical analysis library for Ada: development
OpenToken is a facility for performing token analysis within the Ada language. It is designed to provide all the functionality of a traditional lexical analyzer generator, such as lex. But due to the magic of inheritance and runtime polymorphism it is implemented entirely in Ada as withed-in code. No precompilation step is required, and no messy tool-generated source code is created. . Install this package if you want to write programs that use OpenToken.