I've attached an ebuild for chicken-1.89 (latest). The latest version currently available is chicken-1.22, which is ancient and does not run at all (it just segfaults). The people at #chicken tell me that it's so old its not even worth bothering with, so I made a new ebuild. This package doesn't seem to depend on anything else, except the baselayout stuff, of course.
Created attachment 48677 [details] Ebuild for chicken-1.89
updated in portage. the new ebuild is in dev-scheme/chicken. thanks for providing an ebuild.