Eudev

eudev is a fork of systemd-udev with the goal of obtaining better compatibility with existing software such as OpenRC and Upstart, older kernels, various toolchains and anything else required by users and various distributions.

Migrate from udev to eudev
This section should be completed. Meanwhile, check these forum threads:

Moving from udev (171-r10) to eudev (1.2-r1) http://forums.gentoo.org/viewtopic-t-966786-start-0.html

Broken system switching from udev to eudev http://forums.gentoo.org/viewtopic-t-1011456.html