Just received this message during an update but it seems the libapparmor ebuild has been ported to core-kit meanwhile.

The following update has been skipped due to unsatisfied dependencies:

sys-apps/apparmor:0

  selected: sys-apps/apparmor-2.11.1-r2:0/0::nokit, installed
  skipped: sys-apps/apparmor-2.12.0:0/0::nokit, ebuild scheduled for merge (see unsatisfied dependency below)

emerge: there are no ebuilds to satisfy "~sys-libs/libapparmor-2.12.0".
(dependency required by "sys-apps/apparmor-2.12.0::nokit" [ebuild])

!!! The following update(s) have been skipped due to unsatisfied dependencies
!!! triggered by backtracking:

sys-apps/apparmor-utils:0