Though it is not standard Gentoo practice, I follow Ezra's example, and install ruby and rubygems from the tree, and manage all the gems with the gem command thereafter.
Aaron Kulbe superlag@gentoo.org
<snip>
That, and I need to apologize for my earlier top-post. I was keying that in from a phone, and there wasn't a way to do it right.
So if I ruffled any feathers, it wasn't intentional. 
Cheers,
Aaron Kulbe superlag@gentoo.org