New version 6.5 is out which includes fix for https://bugs.gentoo.org/show_bug.cgi?id=582310 . Renaming the 6.4 ebuild works fine. http://blog.racket-lang.org/2016/04/racket-v65.html
committer Amy Winston <amynka@gentoo.org> 2016-06-03 19:36:28 (GMT) commit 7133d2aae913674790060c940f9418c77e43d3c1 dev-scheme/racket: version bump 6.5 bug #584752 Thank you :)