$ check-deps.sh x11-drivers/xf86-video-modesetting * Checking "x11-drivers/xf86-video-modesetting-0.9.0" * Missing in RDEPEND and DEPEND: sys-fs/udev X86_64;libudev.so.1 /usr/lib64/xorg/modules/drivers/modesetting_drv.so * Nothing links to libraries from these packages: x11-base/xorg-server x11-libs/libpciaccess
The modesetting driver was merged into the xserver, so the seperate xf86-video-modesetting driver is really dead.