ERROR: x11-drivers/ati-drivers-8.40.4 failed.
 * Call stack:
 *                   ebuild.sh, line   46:  Called pkg_setup
 *   ati-drivers-8.40.4.ebuild, line   60:  Called linux-mod_pkg_setup
 *            linux-mod.eclass, line  465:  Called linux-info_pkg_setup
 *           linux-info.eclass, line  558:  Called die
 * The specific snippet of code:
 *      get_version || die "Unable to calculate Linux Kernel version"
 *  The die message:
 *   Unable to calculate Linux Kernel version