title: Minimal prerequisite eclipse version for plugin
body: <p>I developed a plugin using Eclipse Indigo. It depends merely on the <em>usual suspects</em> like <code>org.eclipse.core.runtime</code> etc., there is only a single unusal prerequisiste <code>org.eclipse.imp.runtime</code>.
  I am quite sure that the latter should run with 3.5.</p>
  
  <p>Now I have the problem telling potential users what Eclipse version they'd need at least to install it. </p>
  
  <p>Will it even be installable on previous versions when developed with 3.7?</p>
  
  <p>If so, how can I find out what the minimal required versions are (I hope that I do not need to edit version numbers etc. in the plugin.xml?)</p>
  
  <p>If not, does this mean I have to install, say,  Eclipse 3.5 somewhere and build it there if I want to support 3.5 and higher?</p>