title: Error setting up a virtualenv with jython 2.7b3
body: <p>I'm trying to set up a virtual environment using jython 2.7b3. I'm running Mac OS 10.8.5 in case that's relevant.</p>
  
  <p>I installed virtualenv (1.11.6) using jython and easy_install as recommended here: <a href="http://www.jython.org/jythonbook/en/1.0/appendixA.html" rel="nofollow">http://www.jython.org/jythonbook/en/1.0/appendixA.html</a></p>
  
  <p>But when I run:</p>
  
  <pre><code>$ /usr/local/jython/jython2.7b3/bin/virtualenv jython-venv
  </code></pre>
  
  <p>I get the output:</p>
  
  <pre><code>Cannot find file /usr/local/jython/jython2.7b3/Include (bad symlink)
  New jython executable in jython-venv/bin/jython
  ERROR: The executable jython-venv/bin/jython is not functioning
  ERROR: It thinks sys.prefix is u'/usr/local/jython/jython2.7b3' (should be  u'/..../jython-venv')
  ERROR: virtualenv is not compatible with this system or executable
  </code></pre>
  
  <p>(Where <code>/..../jython-venv</code> stands for the path to the new virtual environment I created.)</p>
  
  <p>When I run <code>jython-venv/bin/jython</code> I get a normal jython prompt:</p>
  
  <pre><code>$ jython-venv/bin/jython
  Jython 2.7b3 (default:e81256215fb0, Aug 4 2014, 02:39:51) 
  [Java HotSpot(TM) 64-Bit Server VM (Oracle Corporation)] on java1.7.0_51
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>What am I missing? Why does virtualenv think the executable doesn't work, even though it seems to be functioning OK by itself? Is it just a matter of telling it the correct <code>sys.prefix</code>? If so how can I do that?</p>
  
  <p>Many thanks in advance for your help...</p>