mr.developer installation fails

This issue is here to track this.

Installing _mr.developer.
While:
  Installing _mr.developer.

An internal error occurred due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/site-packages/zc/buildout/buildout.py", line 1982, in main
    getattr(buildout, command)(args)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/site-packages/zc/buildout/buildout.py", line 668, in install
    installed_files = self[part]._call(recipe.install)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/site-packages/zc/buildout/buildout.py", line 1419, in _call
    return f()
  File "/home/amir/idiap/git/bobs/bob.dap.base/eggs/zc.recipe.egg-2.0.4-py3.6.egg/zc/recipe/egg/egg.py", line 193, in install
    reqs, ws = self.working_set()
  File "/home/amir/idiap/git/bobs/bob.dap.base/eggs/zc.recipe.egg-2.0.4-py3.6.egg/zc/recipe/egg/egg.py", line 82, in working_set
    allow_hosts=self.allow_hosts,
  File "/home/amir/idiap/git/bobs/bob.dap.base/eggs/zc.recipe.egg-2.0.4-py3.6.egg/zc/recipe/egg/egg.py", line 140, in _working_set
    return copy.deepcopy(cache_storage[cache_key])
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 180, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 280, in _reconstruct
    state = deepcopy(state, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 150, in deepcopy
    y = copier(x, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 220, in _deepcopy_tuple
    y = [deepcopy(a, memo) for a in x]
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 220, in <listcomp>
    y = [deepcopy(a, memo) for a in x]
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 150, in deepcopy
    y = copier(x, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 240, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 180, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 280, in _reconstruct
    state = deepcopy(state, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 150, in deepcopy
    y = copier(x, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 240, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 180, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 280, in _reconstruct
    state = deepcopy(state, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 150, in deepcopy
    y = copier(x, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 240, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/home/amir/miniconda/envs/dnn/lib/python3.6/copy.py", line 169, in deepcopy
    rv = reductor(4)
TypeError: can't pickle zipimport.zipimporter objects