serv0 ~ # emerge nvidia-drivers
Calculating dependencies... done!

>>> Verifying ebuild manifests
>>> Running pre-merge checks for x11-drivers/nvidia-drivers-340.104
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/4.9.72-gentoo/build
 * Found sources for kernel version:
 *     4.9.72-gentoo
 * Checking for suitable kernel configuration options...                                                                                                                          [ ok ]

>>> Emerging (1 of 1) x11-drivers/nvidia-drivers-340.104::gentoo
 * NVIDIA-Linux-x86_64-340.104.run BLAKE2B SHA512 size ;-) ...                                                                                                                    [ ok ]
 * nvidia-settings-340.104.tar.bz2 BLAKE2B SHA512 size ;-) ...                                                                                                                    [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found kernel object directory:
 *     /lib/modules/4.9.72-gentoo/build
 * Found sources for kernel version:
 *     4.9.72-gentoo
 * Checking for suitable kernel configuration options...                                                                                                                          [ ok ]
 * Checking for suitable kernel configuration options...                                                                                                                          [ ok ]
>>> Unpacking source...
>>> Unpacking NVIDIA-Linux-x86_64-340.104.run to /mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work
>>> Unpacking nvidia-settings-340.104.tar.bz2 to /mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work
>>> Source unpacked in /mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work
>>> Preparing source in /mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work ...
 * Applying nvidia-340.104-kernel-4.9.patch ...
1 out of 1 hunk FAILED -- saving rejects to file kernel/nv-drm.c.rej                                                                                                              [ !! ]
 * ERROR: x11-drivers/nvidia-drivers-340.104::gentoo failed (prepare phase):
 *   patch -p1  failed with /etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch
 *
 * Call stack:
 *               ebuild.sh, line  124:  Called src_prepare
 *             environment, line 5006:  Called eapply_user
 *             environment, line 1281:  Called eapply '/etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *             environment, line 1251:  Called _eapply_patch '/etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *             environment, line 1189:  Called __helpers_die 'patch -p1  failed with /etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *   isolated-functions.sh, line  117:  Called die
 * The specific snippet of code:
 *   		die "$@"
 *
 * If you need support, post the output of `emerge --info '=x11-drivers/nvidia-drivers-340.104::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=x11-drivers/nvidia-drivers-340.104::gentoo'`.
 * The complete build log is located at '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/temp/build.log'.
 * The ebuild environment file is located at '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/temp/environment'.
 * Working directory: '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work'
 * S: '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work/'

>>> Failed to emerge x11-drivers/nvidia-drivers-340.104, Log file:

>>>  '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/temp/build.log'

 * Messages for package x11-drivers/nvidia-drivers-340.104:

 * ERROR: x11-drivers/nvidia-drivers-340.104::gentoo failed (prepare phase):
 *   patch -p1  failed with /etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch
 *
 * Call stack:
 *               ebuild.sh, line  124:  Called src_prepare
 *             environment, line 5006:  Called eapply_user
 *             environment, line 1281:  Called eapply '/etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *             environment, line 1251:  Called _eapply_patch '/etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *             environment, line 1189:  Called __helpers_die 'patch -p1  failed with /etc/portage/patches/x11-drivers/nvidia-drivers-340.104/nvidia-340.104-kernel-4.9.patch'
 *   isolated-functions.sh, line  117:  Called die
 * The specific snippet of code:
 *   		die "$@"
 *
 * If you need support, post the output of `emerge --info '=x11-drivers/nvidia-drivers-340.104::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=x11-drivers/nvidia-drivers-340.104::gentoo'`.
 * The complete build log is located at '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/temp/build.log'.
 * The ebuild environment file is located at '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/temp/environment'.
 * Working directory: '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work'
 * S: '/mnt/old/home/tmp/portage/x11-drivers/nvidia-drivers-340.104/work/'
serv0 ~ #