$ sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             strict
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              disabled
Policy deny_unknown status:     denied
Memory protection checking:     actual (secure)
Max kernel policy version:      32

$ emerge -pv @selinux-rebuild 

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R    ] sec-policy/selinux-base-2.20190201-r1::security-kit  USE="open_perms peer_perms ubac -doc (-systemd) -unconfined" 0 KiB
[ebuild   R    ] sec-policy/selinux-base-policy-2.20190201-r1::security-kit  USE="(-systemd) -unconfined" 0 KiB
[ebuild   R    ] sec-policy/selinux-xserver-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-dbus-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-lpd-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-virt-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-dirmngr-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-mandb-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-resolvconf-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-samba-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-tor-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-avahi-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-gpm-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-shutdown-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-brctl-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-java-2.20190201-r1::security-kit  USE="alsa" 0 KiB
[ebuild   R    ] sec-policy/selinux-sasl-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-ldap-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-openrc-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-screen-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-chronyd-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-snmp-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-pulseaudio-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-bluetooth-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-irc-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-kerberos-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-policykit-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-chromium-2.20190201-r1::security-kit  USE="alsa" 0 KiB
[ebuild   R    ] sec-policy/selinux-cups-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-devicekit-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-qemu-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-mozilla-2.20190201-r1::security-kit  USE="alsa" 0 KiB
[ebuild   R    ] sec-policy/selinux-gpg-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-xscreensaver-2.20190201-r1::security-kit  0 KiB
[ebuild   R    ] sec-policy/selinux-accountsd-2.20190201-r1::security-kit  0 KiB

# setenforce 0 && /etc/init.d/xdm restart