setuptools-34.0 fails with 'ImportError: No module named packaging.version'

Upgrading to setuptools-34.0 fails with ImportError: No module named packaging.version:





```

pip --version

pip 1.4.1 from /usr/lib/python2.6/site-packages (python 2.6)

```





```

---- Begin output of /usr/bin/pip install  --upgrade setuptools ----

STDOUT: Downloading/unpacking setuptools from https://pypi.python.org/packages/4f/5d/77ab299135d7a882fff2970b45c6a77d7d79db0363c395081770632e6f1d/setuptools-34.0.0.zip#md5=927ea526582deefbf98779b2c302dd3d

  Running setup.py egg_info for package setuptools

    Traceback (most recent call last):

      File "<string>", line 3, in <module>

      File "setuptools/__init__.py", line 12, in <module>

        import setuptools.version

      File "setuptools/version.py", line 1, in <module>

        import pkg_resources

      File "pkg_resources/__init__.py", line 70, in <module>

        import packaging.version

    ImportError: No module named packaging.version

    Complete output from command python setup.py egg_info:

    Traceback (most recent call last):



  File "<string>", line 3, in <module>



  File "setuptools/__init__.py", line 12, in <module>



    import setuptools.version



  File "setuptools/version.py", line 1, in <module>



    import pkg_resources



  File "pkg_resources/__init__.py", line 70, in <module>



    import packaging.version



ImportError: No module named packaging.version

```



CentOS 6 in AWS.

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