lib/libscopi.a(Out_VTK.o): In function `Out_VTK::plot(int)': Out_VTK.cpp:(.text+0x98c): undefined reference to `vtkPolyDataMapper::New()' Out_VTK.cpp:(.text+0x9c6): undefined reference to `vtkLODActor::New()' Out_VTK.cpp:(.text+0xa8a): undefined reference to `vtkRenderer::New()' Out_VTK.cpp:(.text+0xab3): undefined reference to `vtkRenderer::GetActiveCamera()' Out_VTK.cpp:(.text+0xac7): undefined reference to `vtkCamera::SetFocalPoint(double, double, double)'