The libvirt ebuild does not correctly use the enewuser command which now raises an error: "extra arguments no longer supported; please file a bug" libvirt Instead of the line enewuser qemu 77 -1 -1 qemu kvm it should have enewuser qemu 77 -1 -1 "qemu,kvm" as described here: https://devmanual.gentoo.org/ebuild-writing/users-and-groups/
Only reproducible if user "qemu" does not already exist on the system.
*** Bug 592724 has been marked as a duplicate of this bug. ***
Thanks a lot for the bug report! commit 791af11a35ef56dcba6113a5d31be17a4f0e83d9 Author: Matthias Maier <tamiko@gentoo.org> Date: Fri Sep 2 09:39:23 2016 -0500 app-emulation/libvirt: call enewuser with correct no of args, bug #592684 Package-Manager: portage-2.2.28
*** Bug 592758 has been marked as a duplicate of this bug. ***