[Insight-users] WrapITK instal troubles

[Zachary Pincus]

Hi Vincent -

>    import _VXLNumericsPython
> ImportError: libitkvnl.so: cannot open shared object file: No such  
> file or directory
> --------------------------------------------------
>
> I can find libitkvnl.so in
> /usr/local/lib/InsightToolkit/libitkvnl.so
>
> I played a little with some environnement variable
> so that now I have
> PYTHONPATH=/usr/local/lib/InsightToolkit/python/:/usr/local/lib/ 
> InsightToolkit/
> LD_LIBRARY_PATH=/usr/local/lib/InsightToolkit/WrapITK/Python-SWIG
>
> Someone (Gaetan ) ?

/usr/local/lib/InsightToolkit needs to be on the LD_LIBRARY_PATH, not  
the PYTHONPATH.
The files in that directory are the ITK libraries that the loader  
needs to find, not Python extensions. Since ITK doesn't put them in a  
"normal" place (e.g. /usr/local/lib), you need to explicitly tell the  
loader where to find them.

  Also, the first part of the PYTHONPATH should point to:
/usr/local/lib/InsightToolkit/WrapITK/Python/
not
/usr/local/lib/InsightToolkit/python/
The former is the WrapITK directory, and the latter is the python  
directory for the old ITK wrappers.

However, if you did not disable the "Install WrapITK Compatibility"  
option in cmake (or if you ran that install target manually), a file  
called 'WrapITK.pth' was installed in the site-packages directory of  
your python installation. This file tells Python to add the WrapITK  
Python directory to the python path automatically. So in reality, you  
shouldn't need to set PYTHONPATH at all.

I think all of this information should have been in the documentation  
(and the InsightJournal article) -- if we missed one of these steps  
in the docs, please let me know so that we can fix that.

Zach Pincus


> Sincerely,
>    Vincent Pagé.
>
>
>
>
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