As already described in #280650 app-emulation/libvirt requires a nc version that supports the '-U' flag. As netcat6 is hard masked now, this is only the case for net-analyzer/openbsd-netcat. However, the ebuilds for libvirt pull either gnu-netcat, netcat, or openbsd-netcat, resulting in a none-working install if the two former ones are pulled instead of openbsd-netcat.
commit c92468c0a71e7c62917715adb6569b8379e236e2 Author: Matthias Maier <tamiko@gentoo.org> Date: Sun Mar 17 02:08:33 2019 -0500 app-emulation/libvirt: update netcat dependencies Closes: https://bugs.gentoo.org/680632 Package-Manager: Portage-2.3.62, Repoman-2.3.12 Signed-off-by: Matthias Maier <tamiko@gentoo.org>
I have created a pull request on github to propose a fix: https://github.com/gentoo/gentoo/pull/11583
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=01e6609cc66e8259d1b39f455f8c696aac3feda8 commit 01e6609cc66e8259d1b39f455f8c696aac3feda8 Author: Anselm Busse <anselm.busse@outlook.com> AuthorDate: 2019-04-04 08:06:01 +0000 Commit: Matthias Maier <tamiko@gentoo.org> CommitDate: 2019-04-04 14:55:25 +0000 app-emulation/libvirt: fixes dependency on incompatible net-analyzer/gnu-netcat and net-analyzer/netcat Closes: https://bugs.gentoo.org/682494 Closes: https://github.com/gentoo/gentoo/pull/11583 Signed-off-by: Anselm Busse <anselm.busse@outlook.com> Signed-off-by: Matthias Maier <tamiko@gentoo.org> app-emulation/libvirt/libvirt-4.9.0.ebuild | 6 +----- app-emulation/libvirt/libvirt-5.0.0-r1.ebuild | 6 +----- app-emulation/libvirt/libvirt-5.1.0.ebuild | 6 +----- app-emulation/libvirt/libvirt-9999.ebuild | 6 +----- 4 files changed, 4 insertions(+), 20 deletions(-)