There is a new version available upstream. Reproducible: Always
And the maintainer is well-aware of it; it's a non-trivial upgrade breaking loads of stuff and there's no need to file 0day bugs about it. http://www.gentoo.org/doc/en/bugzilla-howto.xml#doc_chap6
Created attachment 118477 [details] radiant-0.6.1.ebuild I've added the ebuild which will be placed in portage to the bug for those of you who want to play with it, but please be aware that upgrading will most likely break your existing radiant setup. I'm currently waiting for the outcome of the GLEP42 discussion as it may be the right way to deliver this message to radiant users.
Since GLEP42 does not seem to be going anywhere fast I've decided to add dev-ruby/radiant-0.6.2 to CVS today, with some warnings attached regarding the upgrade process.