title: On a fresh install of ActivePython-2.6, pip is giving an import error
body: <p>I installed Cent OS on a virtual machine, and it comes with Python 2.4 out of the box. I needed to install Python 2.6, so I installed a separate python binary from ActivePython which installed itself in a different directory. When I run pip (<code>/opt/ActivePython-2.6/bin/pip</code>) I get this error:</p>
  
  <pre><code># pip
  Traceback (most recent call last):
    File "/opt/ActivePython-2.6/bin/pip", line 9, in &lt;module&gt;
      load_entry_point('pip==0.8.1', 'console_scripts', 'pip')()
    File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 305, in load_entry_point
      return get_distribution(dist).load_entry_point(group, name)
    File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 2244, in load_entry_point
      return ep.load()
    File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pkg_resources.py", line 1954, in load
      entry = __import__(self.module_name, globals(),globals(), ['__name__'])
    File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pip/__init__.py", line 10, in &lt;module&gt;
      from pip.basecommand import command_dict, load_command, load_all_commands, command_names
    File "/opt/ActivePython-2.6/lib/python2.6/site-packages/pip/basecommand.py", line 11, in &lt;module&gt;
      import urllib2
    File "/opt/ActivePython-2.6/lib/python2.6/urllib2.py", line 93, in &lt;module&gt;
          import hashlib
    File "/opt/ActivePython-2.6/lib/python2.6/hashlib.py", line 136, in &lt;module&gt;
      md5 = __get_builtin_constructor('md5')
    File "/opt/ActivePython-2.6/lib/python2.6/hashlib.py", line 63, in __get_builtin_constructor
      import _md5
  ImportError: No module named _md5
  </code></pre>
  
  <p>I've never seen this error before, and I don't understand why it would try calling _md5 when the library is just 'md5'. When I attempted symlinking _md5.py to md5.py I get the same error but with <code>ImportError: No module named _md5</code>.</p>