See tracker bug 350792. virtual/baselayout packages: sys-apps/baselayout-vserver The PROVIDE for the virtual has been dropped from sys-apps/baselayout some time ago. So probably baselayout-vserver should do the same and the virtual could be removed entirely.
@prefix: Same for sys-apps/baselayout-prefix (in prefix overlay) and prefix/virtuals. Please remove the virtual from these too.
profiles/prefix/virtuals removed sys-apps/baselayout-prefix updated
In fact, virtual/baselayout was removed from profiles in 2008 already. Therefore, I've fixed the remaining PROVIDEs myself.