I installed kernel-devel, new error is:
ERROR: Unable to load the kernel module 'nvidia.ko'. This happens most frequently
when this kernel module was built against the wrong or improperly configured kernel
sources, with a version of gcc that differs from the one used to
build the target kernel, or if a driver such as rivafb, nvidiafb, or nouveau is
present and prevents the NVIDIA kernel module from obtaining ownership of the NVIDIA
graphics device(s), or no NVIDIA GPU installed in this
system is supported by this NVIDIA Linux graphics driver release.
Please see the log entries 'Kernel module load error' and 'Kernel
messages' at the end of the file '/var/log/nvidia-installer.log' for more
information.