net-libs/gtk-vnc python module builds with --with-gtk=2.0 configuration option app-emulation/virt-manager use dev-python/pygobject:3 for bindings python to GTK+ 3 Please remove [python] from net-libs/gtk-vnc dependency. Reproducible: Always
Thanks for reporting! Fixed in 1.0.1 + 06 Aug 2014; Ian Whyman <thev00d00@gentoo.org> +virt-manager-1.0.1.ebuild, + virt-manager-9999.ebuild: + Bump to 1.0.1, fixes #501532, #509642 and #516414