title: Unable to run virtualenv on OSX?
body: <h3>sudo virtualenv foo</h3>
  
  <pre><code>New python executable in foo/bin/python
  Installing setuptools.............done.
  Installing pip....
    Complete output from command /private/tmp/foo/bin/python -x /private/tmp/foo/bin/easy_install /Library/Python/2.7/...ort/pip-1.2.1.tar.gz:
    /private/tmp/foo/bin/python: can't open file '/private/tmp/foo/bin/easy_install': [Errno 2] No such file or directory
  ----------------------------------------
  ...Installing pip...done.
  Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 8, in &lt;module&gt;
      load_entry_point('virtualenv==1.8.2', 'console_scripts', 'virtualenv')()
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 942, in main
      never_download=options.never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1054, in create_environment
      install_pip(py_executable, search_dirs=search_dirs, never_download=never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 655, in install_pip
      filter_stdout=_filter_setup)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1020, in call_subprocess
      % (cmd_desc, proc.returncode))
  OSError: Command /private/tmp/foo/bin/python -x /private/tmp/foo/bin/easy_install /Library/Python/2.7/...ort/pip-1.2.1.tar.gz failed with error code 2
  </code></pre>
  
  <h3>virtualenv foo</h3>
  
  <pre><code>New python executable in foo/bin/python
  Installing setuptools.............................
    Complete output from command /private/tmp/foo/bin/python -c "#!python
  \"\"\"Bootstra...sys.argv[1:])
  
  
  
  
  
  
  " /Library/Python/2.7/...ols-0.6c11-py2.7.egg:
    error: can't create or remove files in install directory
  
  The following error occurred while trying to add or remove files in the
  installation directory:
  
      [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-1712.write-test'
  
  The installation directory you specified (via --install-dir, --prefix, or
  the distutils default setting) was:
  
      /Library/Python/2.7/site-packages/
  
  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.
  
  For information on other options, you may wish to consult the
  documentation at:
  
    http://peak.telecommunity.com/EasyInstall.html
  
  Please make the appropriate changes for your system and try again.
  
  ----------------------------------------
  ...Installing setuptools...done.
  Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 8, in &lt;module&gt;
      load_entry_point('virtualenv==1.8.2', 'console_scripts', 'virtualenv')()
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 942, in main
      never_download=options.never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1052, in create_environment
      search_dirs=search_dirs, never_download=never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 599, in install_setuptools
      search_dirs=search_dirs, never_download=never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 571, in _install_req
      cwd=cwd)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1020, in call_subprocess
      % (cmd_desc, proc.returncode))
  OSError: Command /private/tmp/foo/bin/python -c "#!python
  \"\"\"Bootstra...sys.argv[1:])
  
  
  
  
  
  
  " /Library/Python/2.7/...ols-0.6c11-py2.7.egg failed with error code 1
  </code></pre>
  
  <p>I am running Python 2.7.3 and have no packages installed except what comes by default, pip and virtualenv on OSX Mountain Lion.</p>