https://luci-milo.appspot.com/buildbot/chromiumos/tatl-paladin/3249

RunCommandError: return code: 1; command: /b/c/cbuild/repository/chromite/bin/cros_sdk -- emerge-tatl -p --cols --quiet --root /var/empty -e virtual/target-os
The following USE changes are necessary to proceed:
 (see "package.use" in the portage(5) man page for more details)
# required by sys-fs/udev-225-r9::chromiumos
# required by virtual/udev-215::portage-stable[-systemd]
# required by media-libs/mesa-18.1_pre1-r5::chromiumos
# required by media-libs/libepoxy-1.4.0::portage-stable
# required by x11-base/xwayland-1.19.5-r2::chromiumos
# required by chromeos-base/vm_guest_tools-0.0.1-r13::chromiumos
# required by virtual/target-termina-os-1.5-r16::termina
# required by virtual/target-os-1.5-r1::termina
# required by virtual/target-os (argument)
>=sys-apps/hwids-20150717-r2 udev
# required by media-libs/libepoxy-1.4.0::portage-stable