chibi-scheme : A very tiny Scheme implementation with decent speed and native hygienic macros. ( http://synthcode.com/wiki/chibi-scheme )
guile-syntax-parse : Racket's syntax-parse adapted for Guile ( https://gitlab.com/guile-syntax-parse/guile-syntax-parse )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a chemoelectric
For Paludis use this rsync : rsync://gentoo.zugaina.org/chemoelectric-portage
If you have a problem : ycarus(-at-)zugaina.org