v5.9-RC1 cannot compile external plugins
I have v5.8.1 and v5.9-RC1 both compiled successfully with PARAVIEW_USE_MPI:BOOL=ON. All my external reader plugins compile flawlessly under v5.8. I cannot configure any of them under v5.9.
Going back to to a plugin distributed with the source, I can compile Examples/Plugins/MyPNGReader flawlessly under v5.8, but I cannot configure the same plugin under v5.9
CMake Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
Could NOT find MPI (missing: MPI_C_FOUND C)
Call Stack (most recent call first):
/usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
/local/apps/ParaView/5.9/lib/cmake/paraview-5.9/vtk/patches/3.17/FindMPI.cmake:1730 (find_package_handle_standard_args)
/local/apps/ParaView/5.9/lib/cmake/paraview-5.9/vtk/VTK-vtk-module-find-packages.cmake:433 (find_package)
/local/apps/ParaView/5.9/lib/cmake/paraview-5.9/vtk/vtk-config.cmake:138 (include)
/local/apps/ParaView/5.9/lib/cmake/paraview-5.9/paraview-config.cmake:53 (find_package)
CMakeLists.txt:4 (find_package)
Do I need a version of cmake greater than 3.16.3?