message: Add WIN32 flag to windows executable
  see
diff: @@ -35,6 +35,8 @@ qt5_add_resources(EXAMPLES_SRC ${CMAKE_SOURCE_DIR}/examples/examples.qrc)
  # Platform specific pre-target setup(s)
  if(${APPLE})
  set(SYSTEM_FLAGS MACOSX_BUNDLE)
  +elseif(${WIN32})
  + set(SYSTEM_FLAGS WIN32)
  endif()
  add_subdirectory(external)
  