+- find_package (ParaView 5.8 CONFIG)
++ SET(PARAVIEW_ROOT_DIR $ENV{PARAVIEW_ROOT_DIR} CACHE PATH "Path to the PARAVIEW")
++ IF(PARAVIEW_ROOT_DIR)
++ LIST(APPEND CMAKE_PREFIX_PATH "${PARAVIEW_ROOT_DIR}")
++ ENDIF(PARAVIEW_ROOT_DIR)
++ FIND_PACKAGE(ParaView 5.9 CONFIG)
+ if (ParaView_FOUND)
+ message(STATUS "Found ParaView: ${ParaView_DIR} (found version \"${ParaView_VERSION}\")")
+ list (APPEND PERSALYS_DEFINITIONS -DPERSALYS_HAVE_PARAVIEW)
++ else()
++ message(FATAL "We absolutely need PARAVIEW!")
+ endif ()
++
+ endif ()
+
+ endif ()