Cross posting https://bugs.gentoo.org/show_bug.cgi?id=519192 in case the maintainer of www-servers/gorg (Manuel Rüger (mrueg)), or anyone else, is interested in fixing this, especially given that gorg used to have prefix support with prefix-specific patch files, gorg-0.6.3-prefix.patch and gorg-0.6.4-prefix.patch, and given that that support seems to have been removed by someone other than the prefix team.
Please file bugs only once. Generally speaking, gorg usage in Gentoo is on a steady decline, we'll stop using it completely in the near future. You really should not use it for anything important as you cannot expect extended support for it. *** This bug has been marked as a duplicate of bug 519192 ***