title: Python LogicError: clGetPlatformIDs failed: platform not found khr
body: <p>While making nosetests for the set of Python programs in Ubuntu an error occurs:</p>
  
  <pre><code>devices = [ d for d in cl.get_platforms()[0].get_devices() if
  LogicError: clGetPlatformIDs failed: platform not found khr
  
  
  File "/home/fateeva/prog/deflectometry/SGMFMeasurement/_PhaseShifts.py", line 30, in &lt;module&gt;
      devices = [ d for d in cl.get_platforms()[0].get_devices() if
  LogicError: clGetPlatformIDs failed: platform not found khr
  </code></pre>
  
  <p>How it's possible to fix it?</p>