Section 4.3 "Package Directories" says:
<https://projects.gentoo.org/pms/6/pms.html#x1-340004.3>

   A package directory contains the following:
   [...]
   * A Manifest file, whose format is described in [GLEP 44].

Which is the only item not marked as optional in that list. Now with
thin manifests the file can end up empty, in which case it is omitted
(e.g. if the package contains only live ebuilds).

So, should we enforce that there is always a Manifest file even if it
is empty, or should we update the spec? I would suggest the latter.

Ulrich