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. 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.