Version 6.4.1 is available upstream. Please consider updating! It seems that version 6.4.1 is available upstream, while the latest version in the Gentoo tree is 6.40. You think this warning is false? Read more about it here.
This package is a pure C implementation of CLIPS.
CLIPS is a forward-chaining rule-based programming language written in C
that also provides procedural and object-oriented programming facilities.