Version 0.7.6 is available upstream. Please consider updating! It seems that version 0.7.6 is available upstream, while the latest version in the Gentoo tree is 0.7.5-r1. You think this warning is false? Read more about it here.
CLX provides an implementation of the X Window System protocol to
Lisp graphics library[ies] and applications. It is the Common Lisp
equivalent of Xlib.