clasp : A Common Lisp with LLVM back end and interoperation with C++ ( https://github.com/clasp-developers/clasp )
sbcl : Steel Bank Common Lisp (SBCL) is an implementation of ANSI Common Lisp ( http://sbcl.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a tgbugs-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/tgbugs-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org