>>> Install nvidia-drivers-1.0.9755-r10 into /var/tmp/portage/x11-drivers/nvidia-drivers-1.0.9755-r10/image/ category x11-drivers
 * Installing nvidia module
 *
 * ERROR: x11-drivers/nvidia-drivers-1.0.9755-r10 failed.
 * Call stack:
 *                            ebuild.sh, line 1684:  Called dyn_install
 *                            ebuild.sh, line 1119:  Called qa_call 'src_install'
 *                            ebuild.sh, line   44:  Called src_install
 *   nvidia-drivers-1.0.9755-r10.ebuild, line  208:  Called src_install-libs
 *   nvidia-drivers-1.0.9755-r10.ebuild, line  316:  Called want_tls
 *   nvidia-drivers-1.0.9755-r10.ebuild, line  436:  Called built_with_use 'sys-libs/glibc' 'nptl'
 *                        eutils.eclass, line 1690:  Called die
 * The specific snippet of code:
 *                                      die)   die "$PKG does not actually support the $1 USE flag!";;
 *  The die message:
 *   sys-libs/glibc-2.6.1 does not actually support the nptl USE flag!
 *
 * 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-drivers-1.0.9755-r10/temp/build.log'.
 *