I think it is this line that makes it not working for me. So we put `#{lib}/vtk-6.0.0` into the `.so` files but I still get
```
ImportError: dlopen(/homebrew/lib/python2.7/site-packages/vtk/vtkCommonCorePython.so, 2): Library not loaded: /homebrew/Cellar/vtk/6.0.0/lib/vtk-6.0.0/libvtkCommonCore-6.0.1.dylib
  Referenced from: /homebrew/Cellar/vtk/6.0.0/lib/libvtkCommonCorePython27D-6.0.1.dylib
  Reason: image not found
```
Because in fact the file is not
`/homebrew/Cellar/vtk/6.0.0/lib/vtk-6.0.0/libvtkCommonCore-6.0.1.dylib` but
`/homebrew/Cellar/vtk/6.0.0/lib/libvtkCommonCore-6.0.1.dylib`

... I am going to change that (so vtk 6 is like `--HEAD` was before)