Please revbump dev-vcs/hub and make this change to the dependencies. ">=dev-lang/go-1.4" should be ">=dev-lang/go-1.4:=". Thanks, William
*hub-2.2.0-r1 (08 Jul 2015) 08 Jul 2015; Vikraman Choudhury (vikraman) <vikraman@gentoo.org> +hub-2.2.0-r1.ebuild, -hub-2.2.0.ebuild: Add slot dep on dev-lang/go. Fixes bug 554174.