Please bump the ebuild to 1.8.2 http://www.argyllcms.com/
Please do *not* CC others. Maintainers will be assigned by the bug wranglers.
Boo, I wanted to help.
And your help is most welcome, as I do not follow the full argyllcms mailing list closely and I have not found an easy way to watch for new releases :) So thanks for the report, 1.8.2 is in tree now (after a few 406 I got when trying to grab the source files)
I got 406 too when I first tried the ebuild! Ran it again, worked fine. I'll let the ArgyllCMS people know, as this could cause Gentoo users who run "emerge -NuDv world" to get frustrated when they return to their computers only to find not much happened as portage bailed out due to 406.