What's the current state of Arduino on Gentoo?

I know (through simple discovery) that I can't simply "emerge arduino"
and expect things to work. I know, because they don't, and I've
already found these references:

https://bugs.gentoo.org/show_bug.cgi?id=340042
https://bugs.gentoo.org/show_bug.cgi?id=378387
https://bugs.gentoo.org/show_bug.cgi?id=377039

and

http://en.gentoo-wiki.com/wiki/Crossdev#AVR_Architecture

(the instructions for which don't currently work)

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:wq