Hello, When I tried to build VTK5.8, there were many errors like VTK5.8/Rendering/vtkXRenderWindowInteractor.h:45: error: ‘Widget’ was not declared in this scope Any comments? Thanks. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20120406/154ce163/attachment.htm>