localhost linux # emerge nvidia-drivers
Calculating dependencies... done!
>>> Verifying ebuild Manifests...

>>> Emerging (1 of 1) x11-drivers/nvidia-drivers-1.0.9755-r10 to /
 * NVIDIA-Linux-x86-1.0-9755-pkg0.run MD5 ;-) ...                         [ ok ]
 * NVIDIA-Linux-x86-1.0-9755-pkg0.run RMD160 ;-) ...                      [ ok ]
 * NVIDIA-Linux-x86-1.0-9755-pkg0.run SHA1 ;-) ...                        [ ok ]
 * NVIDIA-Linux-x86-1.0-9755-pkg0.run SHA256 ;-) ...                      [ ok ]
 * NVIDIA-Linux-x86-1.0-9755-pkg0.run size ;-) ...                        [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking NVIDIA-Linux-x86-1.0-9755-pkg0.run ;-) ...                    [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found sources for kernel version:
 *
  ERROR: Kernel configuration is invalid.
         include/linux/autoconf.h or include/config/auto.conf are missing.
         Run 'make oldconfig && make prepare' on kernel src to fix it.

2.
  ERROR: Kernel configuration is invalid.
         include/linux/autoconf.h or include/config/auto.conf are missing.
         Run 'make oldconfig && make prepare' on kernel src to fix it.

6.
  ERROR: Kernel configuration is invalid.
         include/linux/autoconf.h or include/config/auto.conf are missing.
         Run 'make oldconfig && make prepare' on kernel src to fix it.

21
  ERROR: Kernel configuration is invalid.
         include/linux/autoconf.h or include/config/auto.conf are missing.
         Run 'make oldconfig && make prepare' on kernel src to fix it.

-rc6-sabayon
/usr/portage/eclass/linux-info.eclass: line 196: [: too many arguments
 * These sources have not yet been prepared.
 * We cannot build against an unprepared tree.
 * To resolve this, please type the following:
 *
 * # cd /usr/src/linux
 * # make oldconfig
 * # make modules_prepare
 *
 * Then please try merging this module again.

!!! ERROR: x11-drivers/nvidia-drivers-1.0.9755-r10 failed.
Call stack:
  ebuild.sh, line 1630:   Called dyn_setup
  ebuild.sh, line 702:   Called qa_call 'pkg_setup'
  ebuild.sh, line 44:   Called pkg_setup
  nvidia-drivers-1.0.9755-r10.ebuild, line 119:   Called linux-mod_pkg_setup
  linux-mod.eclass, line 465:   Called check_kernel_built
  linux-info.eclass, line 368:   Called die

!!! Kernel sources need compiling first
!!! If you need support, post the topmost build error, and the call stack if rel                                 evant.
!!! A complete build log is located at '/var/tmp/portage/x11-drivers/nvidia-driv                                 ers-1.0.9755-r10/temp/build.log'.

!!! This ebuild is from an overlay: '/usr/portage/local/layman/sabayon'
localhost linux #