Currently, when trying to use VTKm without CMake, we obtain an error: ``` $ g++-9 -I/usr/local/include/vtkm-1.4 Foo.cxx In file included from /usr/local/include/vtkm-1.4/vtkm/cont/Serialization.h:15, from /usr/local/include/vtkm-1.4/vtkm/cont/ArrayHandle.h:23, from /usr/local/include/vtkm-1.4/vtkm/cont/ArrayHandleUniformPointCoordinates.h:13, from /usr/local/include/vtkm-1.4/vtkm/cont/testing/MakeTestDataSet.h:14, from Foo.cxx:12: /usr/local/include/vtkm-1.4/vtkm/thirdparty/diy/serialization.h:18:34: fatal error: vtkmdiy/include/vtkmdiy/serialization.hpp: No such file or directory 18 | #define VTKM_DIY_INCLUDE(header) <vtkmdiy/include/vtkmdiy/header> | ^ compilation terminated. ``` (In this case `Foo.cxx` was simply the file `vtk-m/examples/tetrahedra/Triangulate.cxx` taken out of it's natural habitat.)