Created attachment 365854 [details] build.log sci-mathematics/sage-doc-6.0_rc1-r1 from sage overlay fails to fetch.
Thanks Jeroen. Dennis, please do not use prereleases unless you intend to test it - these are masked for a reason. Also please report issues with our overlay to https://github.com/cschwan/sage-on-gentoo/issues or send a mail to the science mailing list. I will push ebuild for 6.0 in a day or so, until then please use the stable 5.12.