title: pyopencl errror : undefined symbol: clCreateSubDevices
body: <p>I have installed pyopencl. When I try :</p>
  
  <pre><code> python /home/a/pyopencl/examples/benchmark.py
  </code></pre>
  
  <p>then I have an error :</p>
  
  <pre><code> Traceback (most recent call last):
   File "/home/a/pyopencl/examples/benchmark.py", line 6, in &lt;module&gt;
   import pyopencl as cl
   File "/usr/local/lib/python2.7/dist-packages/pyopencl-2013.3-py2.7-linux-   
   x86_64.egg/pyopencl/__init__.py", line 28, in &lt;module&gt;
   import pyopencl._cl as _cl
   ImportError: /usr/local/lib/python2.7/dist-packages/pyopencl-2013.3-py2.7-linux-     
   x86_64.egg/pyopencl/_cl.so: undefined symbol: clCreateSubDevices
  </code></pre>
  
  <p>How can I solve it ?</p>
  
  <p>TIA</p>
  
  <pre><code> Python 2.7.5+ (default, Sep 19 2013, 13:48:49) 
   [GCC 4.8.1] on linux2
   Linux zalman 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64   
   x86_64 x86_64 GNU/Linux
  </code></pre>
  
  <pre>
  +------------------------------------------------------+                       
  | NVIDIA-SMI 4.304.88   Driver Version: 304.88         |                       
  |-------------------------------+----------------------+----------------------+
  | GPU  Name                     | Bus-Id        Disp.  | Volatile Uncorr. ECC |
  | Fan  Temp  Perf  Pwr:Usage/Cap| Memory-Usage         | GPU-Util  Compute M. |
  |===============================+======================+======================|
  |   0  GeForce GTX 770          | 0000:01:00.0     N/A |                  N/A |
  | 25%   29C  N/A     N/A /  N/A |   7%  149MB / 2047MB |     N/A      Default |
  +-------------------------------+----------------------+----------------------+
  
  +-----------------------------------------------------------------------------+
  | Compute processes:                                               GPU Memory |
  |  GPU       PID  Process name                                     Usage      |
  |=============================================================================|
  |    0            Not Supported                                               |
  +-----------------------------------------------------------------------------+
  </pre>
  
  <pre><code> ls /etc/OpenCL/vendors
   nvidia.icd
  
  
  
   locate libOpenCL.so
  
  
   /etc/alternatives/x86_64-linux-gnu_libOpenCL.so
   /etc/alternatives/x86_64-linux-gnu_libOpenCL.so_lib32
   /usr/lib/libOpenCL.so
   /usr/lib/x86_64-linux-gnu/libOpenCL.so
   /usr/lib32/libOpenCL.so
  
    nvcc --version
    nvcc: NVIDIA (R) Cuda compiler driver
    Copyright (c) 2005-2012 NVIDIA Corporation
    Built on Fri_Sep_21_17:28:58_PDT_2012
    Cuda compilation tools, release 5.0, V0.2.1221
  </code></pre>