RDEPEND has '>=x11-base/xorg-server-1.12[udev]', but evdev_drv.so links to libudev directly: $ check-deps.sh x11-drivers/xf86-input-evdev * Checking "x11-drivers/xf86-input-evdev-2.9.1" * Missing in RDEPEND and DEPEND: sys-fs/udev X86_64;libudev.so.1 /usr/lib64/xorg/modules/input/evdev_drv.so * Nothing links to libraries from these packages: x11-base/xorg-server
commit 7034e048dcc9e57ee24c23900110cd81041c295b Author: Matt Turner <mattst88@gentoo.org> Date: Fri Jan 27 21:37:11 2017 -0800 x11-drivers/xf86-input-evdev: Add missing virtual/libudev:= dependency.