Problem importing povray from esys.lsm

Hi when I try to run bingle_vis.py I get the following message:

juan@juan-MacBookPro:~/Esys$ mpirun -np 2 esysparticle bingle_vis.py
CSubLatticeControler::initMPI()
Traceback (most recent call last):
  File "bingle_vis.py", line 4, in <module>
    from esys.lsm.vis import povray
  File "/usr/lib/python2.7/dist-packages/esys/lsm/vis/__init__.py", line 19, in <module>
    import vtk
  File "/usr/lib/python2.7/dist-packages/esys/lsm/vis/vtk/__init__.py", line 18, in <module>
    from arrow import *
  File "/usr/lib/python2.7/dist-packages/esys/lsm/vis/vtk/arrow.py", line 17, in <module>
    import vtk as kwvtk # Kitware's vtk package
ImportError: No module named vtk

I'm running Ubuntu 12.04 so I had to manually install povray, i ran ./install test and povray is properly installed. Do I need to redirect something somewhere?

Thanks,
Juan