(bin3)andy@pdq2s-MacBook-Pro-2 iron-horse default-r1084 (tip) ~/Documents/OTTD_graphics/Iron_Horse/iron-horse $ make pw=1
[GENERATE]
[BUILD] build_iron_horse.py
[RENDER GRAPHICS] render_graphics.py
[IMPORT VEHICLES] iron_horse.py
3.89s
[RENDER LANG] render_lang.py
0.02s
[RENDER NML & NFO] render_nml_nfo.py
Rendering header
Rendering cargo_table
Rendering railtype_table
Rendering disable_default_vehicles
Rendering chaplin
Traceback (most recent call last):
  File "src/build_iron_horse.py", line 30, in <module>
    render_nml_nfo.main()
  File "/Users/andy/Documents/OTTD_graphics/Iron_Horse/iron-horse/src/render_nml_nfo.py", line 161, in main
    render_dispatcher(consists, renderer=render_consist_nml_nfo)
  File "/Users/andy/Documents/OTTD_graphics/Iron_Horse/iron-horse/src/render_nml_nfo.py", line 128, in render_dispatcher
    pool.map(renderer, items)
  File "/Users/andy/Documents/workspace/buildout.python/parts/opt/lib/python3.4/multiprocessing/pool.py", line 260, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/Users/andy/Documents/workspace/buildout.python/parts/opt/lib/python3.4/multiprocessing/pool.py", line 599, in get
    raise self._value
  File "/Users/andy/Documents/workspace/buildout.python/parts/opt/lib/python3.4/multiprocessing/pool.py", line 383, in _handle_tasks
    put(task)
  File "/Users/andy/Documents/workspace/buildout.python/parts/opt/lib/python3.4/multiprocessing/connection.py", line 206, in send
    self._send_bytes(ForkingPickler.dumps(obj))
  File "/Users/andy/Documents/workspace/buildout.python/parts/opt/lib/python3.4/multiprocessing/reduction.py", line 50, in dumps
    cls(buf, protocol).dump(obj)
_pickle.PicklingError: Can't pickle <class 'dict_keys'>: attribute lookup dict_keys on builtins failed
make: *** [iron-horse-nml] Error 1