New version of vmtk needs some vtk related fixes

[Andreas Tille]

Hi Johannes,

On Fri, Sep 07, 2018 at 05:14:08PM +0200, Johannes Ring wrote:
> There is a package python3-vtk7 and vmtk supports Python 3, so that might
> work better.

I confirm that works "better" and I commited this.  Unfortunately it does
not build.
 
> Unfortunately, I haven't got time to look at this myself at the moment.

Same here - I'll leave this for somebody else now.

Kind regards

       Andreas.

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