code: def is_compatible(cls):
          ''' Check OS '''
          is_64bit = struct.calcsize('P')*8 == 64
          if (_platform == "darwin" and is_64bit):
              return True
          else:
              print("Linux tunnels are currenlty unsupported.  Please notify "\
                    "authors@psiturk.org\nif you'd like to see this feature.")
              return Falsf is_compatible(cls):
          ''' Check OS '''
          is_64bit = struct.calcsize('P')*8 == 64
          if (_platform == "darwin" and is_64bit):
              return True
          else:
              print("Linux tunnels are currenlty unsupported.  Please notify "\
                    "authors@psiturk.org\nif you'd like to see this feature.")
              return False
docs: Check OS