Error when trying to pip install pyobjc-core

gistfile1.txt

[last: 0] marca@SCML-MarcA:~/dev/svn-repos$ svn co http://svn.red-bean.com/pyobjc/trunk/pyobjc/pyobjc-core && pyobjc-core...
[last: 0] marca@SCML-MarcA:~/dev/svn-repos/pyobjc-core$ virtualenv env && source env/bin/activate

New python executable in env/bin/python
Installing setuptools............done.
Installing pip...............done.
(env)[last: 0] marca@SCML-MarcA:~/dev/svn-repos/pyobjc-core$ which pip
/Users/marca/dev/svn-repos/pyobjc-core/env/bin/pip
(env)[last: 0] marca@SCML-MarcA:~/dev/svn-repos/pyobjc-core$ pip install .Unpacking /Users/marca/dev/svn-repos/pyobjc-core
  Running setup.py egg_info for package from file:///Users/marca/dev/svn-repos/pyobjc-core
    /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'use_2to3'
      warnings.warn(msg)
    Traceback (most recent call last):
      File "<string>", line 14, in <module>
      File "/var/folders/Z8/Z8PqKjxVE9yN98-ty2Nin-GaxZc/-Tmp-/pip-3Xyh27-build/setup.py", line 464, in <module>
        **extra_args
      File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 152, in setup
        dist.run_commands()
      File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 953, in run_commands
        self.run_command(cmd)
      File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 972, in run_command
        cmd_obj.run()
      File "/var/folders/Z8/Z8PqKjxVE9yN98-ty2Nin-GaxZc/-Tmp-/pip-3Xyh27-build/setup.py", line 121, in run
        orig_egg_info.egg_info.run(self)
      File "<string>", line 7, in replacement_run
    AttributeError: class egg_info has no attribute 'iter_entry_points'
    Complete output from command python setup.py egg_info:
    /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'use_2to3'

  warnings.warn(msg)

running egg_info

creating pip-egg-info/pyobjc_core.egg-info

Traceback (most recent call last):

  File "<string>", line 14, in <module>

  File "/var/folders/Z8/Z8PqKjxVE9yN98-ty2Nin-GaxZc/-Tmp-/pip-3Xyh27-build/setup.py", line 464, in <module>

    **extra_args

  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 152, in setup

    dist.run_commands()

  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 953, in run_commands

    self.run_command(cmd)

  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 972, in run_command

    cmd_obj.run()

  File "/var/folders/Z8/Z8PqKjxVE9yN98-ty2Nin-GaxZc/-Tmp-/pip-3Xyh27-build/setup.py", line 121, in run

    orig_egg_info.egg_info.run(self)

  File "<string>", line 7, in replacement_run

AttributeError: class egg_info has no attribute 'iter_entry_points'

----------------------------------------
Command python setup.py egg_info failed with error code 1 in /var/folders/Z8/Z8PqKjxVE9yN98-ty2Nin-GaxZc/-Tmp-/pip-3Xyh27-build
Storing complete log in /Users/marca/.pip/pip.log