title: Eclipse RCP built by Tycho includes unwanted optional dependencies
body: <p>This is a question which has been frequently asked in the Tycho community:</p>
  
  <blockquote>
    <p>I migrated my Eclipse RCP build from [<em>previous technology</em>, e.g. <code>eclipse-application</code>/ PDE headless build / ...] to the new <a href="http://wiki.eclipse.org/Tycho/Packaging_Types#Creating_Product_Zip_Files" rel="noreferrer">recommended way of building products with Tycho</a> using the packaging type <code>eclipse-repository</code>. Now my distribution contains more bundles than before.</p>
    
    <p>The problem seems to be that Tycho pulls in the optional dependencies of the bundles included in my product. How can I prevent this?</p>
  </blockquote>