/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917/src/sna/sna_driver.c: In function 'sna_handle_uevents':
/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917/src/sna/sna_driver.c:799:2: error: implicit declaration of function 'fstat' [-Werror=implicit-function-declaration]
  if (fstat(sna->kgem.fd, &s) || memcmp(&s.st_rdev, &udev_devnum, sizeof (dev_t)
  ^
/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917/src/sna/sna_driver.c:799:2: warning: nested extern declaration of 'fstat' [-Wnested-externs]
cc1: some warnings being treated as errors
Makefile:638: recipe for target 'sna_driver.lo' failed
make[4]: *** [sna_driver.lo] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: Leaving directory '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build/src/sna'
Makefile:653: recipe for target 'all-recursive' failed
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build/src/sna'
Makefile:598: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build/src'
Makefile:468: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build'
Makefile:399: recipe for target 'all' failed
make: *** [all] Error 2
 * ERROR: x11-drivers/xf86-video-intel-2.99.917::gentoo failed (compile phase):
 *   emake failed
 *
 * If you need support, post the output of `emerge --info '=x11-drivers/xf86-video-intel-2.99.917::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=x11-drivers/xf86-video-intel-2.99.917::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/temp/environment'.
 * Working directory: '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build'
 * S: '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917'

>>> Failed to emerge x11-drivers/xf86-video-intel-2.99.917, Log file:

>>>  '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/temp/build.log'

 * Messages for package x11-drivers/xf86-video-intel-2.99.917:

 * ERROR: x11-drivers/xf86-video-intel-2.99.917::gentoo failed (compile phase):
 *   emake failed
 *
 * If you need support, post the output of `emerge --info '=x11-drivers/xf86-video-intel-2.99.917::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=x11-drivers/xf86-video-intel-2.99.917::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/temp/environment'.
 * Working directory: '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917_build'
 * S: '/var/tmp/portage/x11-drivers/xf86-video-intel-2.99.917/work/xf86-video-intel-2.99.917'