nvidia-installer log file '/var/log/nvidia-installer.log'
creation time: Wed Aug 19 12:50:21 2015
installer version: 340.76

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

nvidia-installer command line:
    ./nvidia-installer

Using: nvidia-installer ncurses user interface
-> License accepted.
-> Installing NVIDIA driver version 340.76.
-> There appears to already be a driver installed on your system (version: 340.76).  As part of installing this driver (version: 340.76), the existing driver will be uninstalled.  Are you sure you want to continue? (Answer: Continue installation)
-> Running distribution scripts
   executing: '/usr/lib/nvidia/pre-install'...
-> done.
-> The distribution-provided pre-install script failed!  Are you sure you want to continue? (Answer: Continue installation)
-> Performing CC sanity check with CC="/usr/bin/cc".
ERROR: Unable to find the kernel source tree for the currently running kernel.  Please make sure you have installed the kernel source files for your kernel and that they are properly configured; on Red Hat Linux systems, for example, be sure you have the 'kernel-source' or 'kernel-devel' RPM installed.  If you know the correct kernel source files are installed, you may specify the kernel source path with the '--kernel-source-path' command line option.
ERROR: Installation has failed.  Please see the file '/var/log/nvidia-installer.log' for details.  You may find suggestions on fixing installation problems in the README available on the Linux driver download page at www.nvidia.com.