VTK_MODULE_INIT in 9.0.1 ?

Support
22

The link fails because vtkExtractCells::GetMTime() was removed in VTK 9. But because it was removed, nothing should be calling it! So there is an inconsistency in your build. I suspect one of the following:

  1. Maybe your code is still picking up VTK 8.2 header files from somewhere?
  2. There might be a stale object file in your project that is being linked.