Error while enabling the vtkDICOM module in VTK 8.2.0

I try to enable the vtkDICOM module in VTK 8.2.0, I set the Module vtkDICOM option for the cmake cache:
cmake -D Module_vtkDICOM :BOOL=ON …/vtk -source
then I got the warning:
CMake Warning:
** Manually-specified variables were not used by the project:**
** Module_vtkDICOM**

does anybody know how to handle this?
thanks