both final and non-final versions satisfy a requirement, then the
  final version will be used even if it is older.  The normal way to
  override this for specific packages is to specifically require a
  non-final version, either specifically or via a lower bound.

- There is a buildout prefer-final version that can be used with a
  value of "false"::

prefer-final = false

To prefer newer versions, regardless of whether or not they are
  final, buildout-wide.


git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@79039 62d5b8a3-27da-0310-9561-8e5933582275