Hi, Does anyone know why: #cmakedefine VTK_USE_QUARTZ #ifdef VTK_USE_QUARTZ #undef VTK_USE_OGLR #endif which is in vtkToolkits.h.in leads to VTK_USE_QUARTZ being defined when checked by vtkGraphicsFactory.cxx in the continuous build on amber? It doesn't cause problems when I test it when building from scratch on a RH7.2 machine here. Thanks for any insights. Yves