* DRM module not built
>>> Source compiled.
>>> Test phase [not enabled]: x11-drivers/ati-drivers-8.21.7-r1

>>> Install ati-drivers-8.21.7-r1 into /var/tmp/portage/ati-drivers-8.21.7-r1/image/ category x11-drivers
 * Installing fglrx module
install: cannot stat `fglrx.ko': No such file or directory

!!! ERROR: x11-drivers/ati-drivers-8.21.7-r1 failed.
Call stack:
  ebuild.sh, line 1539:   Called dyn_install
  ebuild.sh, line 1013:   Called src_install
  ati-drivers-8.21.7-r1.ebuild, line 182:   Called linux-mod_src_install
  linux-mod.eclass, line 497:   Called die

!!! doins fglrx.ko failed
!!! If you need support, post the topmost build error, and the call stack if relevant.