code: def load_libzbar():
      
      global LIBZBAR
      global EXTERNAL_DEPENDENCIES
      if not LIBZBAR:
          libzbar, dependencies = zbar_library.load()
          LIBZBAR = libzbar
          EXTERNAL_DEPENDENCIES = [LIBZBAR] + dependencies
  
      return LIBZBAR
docs: Loads the zbar shared library and its dependencies.
  
      Populates the globals LIBZBAR and EXTERNAL_DEPENDENCIES.