ospray target was not found when compiling a ParaView plugin

We are building a collection of filters in a Paraview plugin and have encoutered an error when ParaView is compiled with the option: PARAVIEW_USE_RAYTRACING. During the generate phase of our project we have the following error:

 CMake Error at /home/charles/Software/compil/ParaView/build/lib64/cmake/paraview-5.7/ParaViewPlugin.cmake:935 (add_library):
   Target "TopologyToolKit" links to target "ospray::ospray" but the target
   was not found.  Perhaps a find_package() call is missing for an IMPORTED
   target, or an ALIAS target is missing?
 Call Stack (most recent call first):
   paraview/singlePlugin/CMakeLists.txt:1 (paraview_add_plugin)



 CMake Error at /home/charles/Software/compil/ParaView/build/lib64/cmake/paraview-5.7/vtkModuleWrapClientServer.cmake:179 (add_library):
   Target "ttkUncertainDataEstimatorCS" links to target "ospray::ospray" but
   the target was not found.  Perhaps a find_package() call is missing for an
   IMPORTED target, or an ALIAS target is missing?
 Call Stack (most recent call first):
   /home/charles/Software/compil/ParaView/build/lib64/cmake/paraview-5.7/vtkModuleWrapClientServer.cmake:305 (_vtk_module_wrap_client_server_library)
   /home/charles/Software/compil/ParaView/build/lib64/cmake/paraview-5.7/ParaViewPlugin.cmake:655 (vtk_module_wrap_client_server)
   paraview/singlePlugin/CMakeLists.txt:1 (paraview_add_plugin)

...

Maybe a fing_dependency is missing in a ParaView cmake file somewhere?

Charles