localhost ~ # emerge -s gentoo-sources
Searching...  |
!!! ERROR: sys-kernel/gentoo-sources-2.6.18-r3 failed.
Call stack:
  ebuild.sh, line 1461:   Called source '/usr/portage/local/layman/sabayon/sys-kernel/gentoo-sources/gentoo-sources-2.6.18-r3.ebuild'
  gentoo-sources-2.6.18-r3.ebuild, line 9:   Called inherit 'kernel-2'
  ebuild.sh, line 1191:   Called die

!!! kernel-2.eclass could not be found by inherit()
!!! If you need support, post the topmost build error, and the call stack if relevant.