message: Turn off deprecated declarations (e.g., Qt 5.15)
diff: @@ -55,6 +55,10 @@ if(USE_OPENGL)
  endif()
  if(USE_QT)
  + if (NOT MSVC)
  + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated-declarations")
  + endif()
  +
  add_subdirectory(qtgui)
  include_directories(${CMAKE_CURRENT_BINARY_DIR}/qtgui)
  if(USE_OPENGL)
  