# Unable to use constellation block

**URL:** <https://www.ruby-forum.com/t/unable-to-use-constellation-block/238170>\
**Category:** GNU Radio\
**Created:** [December 20, 2013, 10:34am UTC](https://www.ruby-forum.com/t/unable-to-use-constellation-block/238170 "2013-12-20T10:34:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [December 20, 2013, 10:34am UTC](https://www.ruby-forum.com/t/unable-to-use-constellation-block/238170/1 "2013-12-20T10:34:43Z")

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_Hi everyone,_

_I installed gnuradio using binary packages provided by ETTUS RESEARCH  
._

- 

```
    I installed gnuradio 3.7.2.1 and processor Im using is intel 

```

i3  
64bit.\*  
\*Everything installed with no issues but when using constellation  
block,  
Im facing the some problem and below is the error \*

File “/home/sandhya/top\_block.py”, line 16, in   
from gnuradio.wxgui import constsink\_gl  
File “/usr/lib/python2.7/dist-  
packages/gnuradio/wxgui/constsink\_gl.py”, line 25, in   
import const\_window  
File  
“/usr/lib/python2.7/dist-packages/gnuradio/wxgui/const\_window.py”,  
line 25, in   
import plotter  
File  
“/usr/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/ **init**.py”,  
line  
22, in   
from channel\_plotter import channel\_plotter  
File  
“/usr/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/channel\_plotter.py”,  
line 23, in   
from grid\_plotter\_base import grid\_plotter\_base  
File  
“/usr/lib/python2.7/dist-packages/gnuradio/wxgui/plotter/grid\_plotter\_base.py”,  
line 24, in   
from OpenGL import GL  
File “/usr/lib/pymodules/python2.7/OpenGL/GL/ **init**.py”, line 11, in  
  
from OpenGL.GL.VERSION.GL\_1\_2 import \*  
ImportError: No module named VERSION.GL\_1\_2

_Checking out the previous thread I found two solutions_

“First, you can probably install python-opengl on your system. Or you  
can  
turn of GL support by editing the file in (probably)  
/usr/local/etc/gnuradio/conf.  
d/gr-wxgui.conf and change the ‘style = auto’ option to 'style = nongl”

_But either of the two solutions are working and throwing me the same  
error._

\*Anyone can help me on this \*

_Thanks_  
_sandhya_

---

<div class="post-metadata">

**Author:** ![sandhya\_g](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/47e85d/32.png) [@sandhya\_g](https://www.ruby-forum.com/u/sandhya_g)\
**Post date:** [December 20, 2013, 8:25pm UTC](https://www.ruby-forum.com/t/unable-to-use-constellation-block/238170/2 "2013-12-20T20:25:27Z")

</div>

On Fri, Dec 20, 2013 at 4:33 AM, Sandhya G [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> 22, in

The constellation sink does not have a non-OpenGL version, so you have  
to  
have OpenGL support (software and hardware). I’m guessing there is  
something more you need to do to get opengl on your system.

Tom