sabasthenes demosthenes # emerge nvidia-legacy-drivers
Calculating dependencies... done!

>>> Emerging (1 of 1) x11-drivers/nvidia-legacy-drivers-1.0.7184-r91 to /
>>> Downloading 'http://distfiles.gentoo.org/distfiles/NVIDIA-Linux-x86-1.0-7184-pkg0.run'
--03:31:15--  http://distfiles.gentoo.org/distfiles/NVIDIA-Linux-x86-1.0-7184-pkg0.run
           => `/usr/portage/distfiles/NVIDIA-Linux-x86-1.0-7184-pkg0.run'
Resolving distfiles.gentoo.org... 216.165.129.135, 156.56.247.195, 64.50.236.52, ...
Connecting to distfiles.gentoo.org|216.165.129.135|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 5,580,032 (5.3M) [text/plain]

100%[====================================>] 5,580,032    156.08K/s    ETA 00:00

03:31:53 (149.42 KB/s) - `/usr/portage/distfiles/NVIDIA-Linux-x86-1.0-7184-pkg0.run' saved [5580032/5580032]

 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking NVIDIA-Linux-x86-1.0-7184-pkg0.run ;-) ...                    [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * 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-legacy-drivers-1.0.7184-r91 failed.
Call stack:
  ebuild.sh, line 1630:   Called dyn_setup
  ebuild.sh, line 702:   Called qa_call 'pkg_setup'
  ebuild.sh, line 38:   Called pkg_setup
  nvidia-legacy-drivers-1.0.7184-r91.ebuild, line 102:   Called linux-mod_pkg_setup
  linux-mod.eclass, line 459:   Called linux-info_pkg_setup
  linux-info.eclass, line 554:   Called die

!!! Unable to calculate Linux Kernel version
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/x11-drivers/nvidia-legacy-drivers-1.0.7184-r91/temp/build.log'.

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