cmake CAVEINTERACTION_HAS_COLLABORATION examples

Kitware/ParaView Plugins/CAVEInteraction/CMakeLists.txt :37 

set_property(
  SOURCE
  pqVRDockPanel.cxx
  pqVRCollaborationWidget.cxx
  APPEND PROPERTY
    COMPILE_DEFINITIONS "CAVEINTERACTION_HAS_COLLABORATION=$<BOOL:${VTK_ENABLE_VR_COLLABORATION}>")