eudev@gentoo.org enable blkid support enable EFI support enable libudev gobject interface read vendor/device string database and add it to udev database map custom hardware's multimedia keys enable module loading through libkmod enable module loading support - use modutils calls if kmod not enabled install the OpenRC init scripts enable SMACK security model install legacy rule generator rules and support scripts - note that the functionality within was dropped from sys-fs/udev as it is not stable in all cases; use at your own risk gentoo/eudev