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If you wish to use eudev instead of udev, you may mask the package sys-fs/udev, but do NOT make the mistake of adding the -udev US flag in make.conf.
You may have:
$ cat /etc/portage/package.mask/systemd
But in /etc/portage/make.conf:
# Do NOT add -udev simply because you want to use eudev!
USE=" ... -systemd ..."