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If you have any questions or experience any problem related to this ebuild, don't hesitate to open a new ticket and we'll do our best to assist you.

* Messages for package x11-drivers/nvidia-drivers:

* You must be in the video group to use the NVIDIA device
* For more info, read the docs at
* https://www.gentoo.org/doc/en/nvidia-guide.xml#doc_chap3_sect6
* This ebuild installs a kernel module and X driver. Both must
* match explicitly in their version. This means, if you restart
* X, you must modprobe -r nvidia before starting it back up
* To use the NVIDIA GLX, run "eselect opengl set nvidia"
* To use the NVIDIA CUDA/OpenCL, run "eselect opencl set nvidia"
* NVIDIA has requested that any bug reports submitted have the
* output of nvidia-bug-report.sh included.
* (Note: Above message is only printed the first time package is
* installed. Please look at /usr/share/doc/nvidia-drivers-375.26/README.gentoo*
* for future reference)


The uvm USE flag is necessary to use nvenc:


Could not find a Makefile in the kernel source directory

Sample error message:

* Messages for package x11-drivers/nvidia-drivers-396.45:

* Could not find a Makefile in the kernel source directory.
* Please ensure that /usr/src/linux points to a complete set of Linux sources
* Unable to calculate Linux Kernel version for build, attempting to use running version
* Could not find a usable .config in the kernel source directory.
* Please ensure that /usr/src/linux points to a configured set of Linux sources.
* If you are using KBUILD_OUTPUT, please set the environment var so that
* it points to the necessary object directory so that it might find .config.
* ERROR: x11-drivers/nvidia-drivers-396.45::gentoo failed (setup phase):
*   Kernel not configured; no .config found in
* Call stack:
*                      ebuild.sh, line 124:  Called pkg_setup
*   nvidia-drivers-396.45.ebuild, line 135:  Called linux-mod_pkg_setup
*               linux-mod.eclass, line 586:  Called linux-info_pkg_setup
*              linux-info.eclass, line 965:  Called check_extra_config
*              linux-info.eclass, line 773:  Called require_configured_kernel
*              linux-info.eclass, line 307:  Called die
* The specific snippet of code:
*              die "Kernel not configured; no .config found in ${KV_OUT_DIR}"
* If you need support, post the output of `emerge --info '=x11-drivers/nvidia-drivers-396.45::gentoo'`,
* the complete build log and the output of `emerge -pqv '=x11-drivers/nvidia-drivers-396.45::gentoo'`.
* The complete build log is located at '/var/tmp/portage/x11-drivers/nvidia-drivers-396.45/temp/build.log'.
* The ebuild environment file is located at '/var/tmp/portage/x11-drivers/nvidia-drivers-396.45/temp/die.env'.
* Working directory: '/var/tmp/portage/x11-drivers/nvidia-drivers-396.45/homedir'
* S: '/var/tmp/portage/x11-drivers/nvidia-drivers-396.45/work/'

Find cause and solution here:

External resources