!!! ERROR: x11-drivers/ati-drivers-8.32.5 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 4093:   Called src_compile
  ati-drivers-8.32.5.ebuild, line 157:   Called linux-mod_src_compile
  linux-mod.eclass, line 516:   Called die

!!! Unable to make  GCC_VER_MAJ=4 KVER=2.6.20-gentoo-r8 KDIR=/usr/src/linux kmod_build.
!!! 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/ati-drivers-8.32.5/temp/build.log'.

before that:
make[2]: *** [/var/tmp/portage/x11-drivers/ati-drivers-8.32.5/work/common/lib/modules/fglrx/build_mod/firegl_public.o] Error 1
make[1]: *** [_module_/var/tmp/portage/x11-drivers/ati-drivers-8.32.5/work/common/lib/modules/fglrx/build_mod] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.20-gentoo-r8'
make: *** [kmod_build] Error 2