refixed form.</p>

<p>When using import, the imported target's depends attribute
  remains unchanged, i.e. it uses "normal" names and allows you to
  override targets in the dependency list.</p>

<p>When using include, the included targets cannot be overridden and
  their depends attributes are rewritten so that prefixed names are
  used.  This allows writers of the included file to control which
  target is invoked as part of the dependencies.</p>

<p>It is possible to include the same file more than once 