title: can't create or remove files in install directory: Difficulty installing pip
body: <p>I am running Enthought python on a Mac in 32 bit mode</p>
  
  <p>my PATH varaible is set at PATH=/Library/Frameworks/Python.framework/Versions/Current/bin:/Library/Frameworks/Python.framework/Versions/Current/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin</p>
  
  <p>when I attempt an install or easy_install I get "cant creat or remove files in the install directory"</p>
  
  <p>here is the trace (ls -l of the directory follows as well)</p>
  
  <p>Johns-MacBook-Pro:bin jc_macpro$ easy_install pip
  error: can't create or remove files in install directory</p>
  
  <p>The following error occurred while trying to add or remove files in the
  installation directory:</p>
  
  <pre><code>[Errno 13] Permission denied: '/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/test-easy-install-516.write-test'
  </code></pre>
  
  <p>The installation directory you specified (via --install-dir, --prefix, or
  the distutils default setting) was:</p>
  
  <pre><code>/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/
  </code></pre>
  
  <p>Perhaps your account does not have write access to this directory?  If the
  installation directory is a system-owned directory, you may need to sign in
  as the administrator or "root" account.  If you do not have administrative
  access to this machine, you may wish to choose a different installation
  directory, preferably one that is listed in your PYTHONPATH environment
  variable.</p>
  
  <p>For information on other options, you may wish to consult the
  documentation at:</p>
  
  <p><a href="http://packages.python.org/distribute/easy_install.html" rel="noreferrer">http://packages.python.org/distribute/easy_install.html</a></p>
  
  <p>Please make the appropriate changes for your system and try again.</p>
  
  <p>===========================
  when i look at site-packages, it has the following access privileges.  I am the administrator account.</p>
  
  <p>drwxrwxr-x   107 root  wheel    3638 Oct 21 09:55 site-packages</p>