See url validation https://github.com/pkgcore/pkgcore/blob/master/src/pkgcore/sync/git.py#L12-L13 In documentation here https://wiki.gentoo.org/wiki/Project:GURU/Information_for_Contributors the url is git@git.gentoo.org:repo/proj/guru.git I believe it should be changed to git://git.gentoo.org/repo/proj/guru.git
My pkgdev error was > no known syncer support See related https://github.com/pkgcore/pkgdev/issues/43
Related PR to fix the upstream https://github.com/pkgcore/pkgcore/pull/434
Fixed in pkgcore v0.12.27 and v0.12.26