title: Py2app error ImportError: No module named httplib2
body: <p>I am trying to build a standalone application for Mac using py2app. However, I am running into a error that terminates the program. For some reason, it appears, when building this application the httplib2 module is not included. These are the commands I run </p>
  
  <pre><code>$ py2applet --make-setup main.py
  $ rm -rf build dist
  $ python setup.py py2app -A
  $ ./dist/main.app/Contents/MacOS/main
  </code></pre>
  
  <p>I receive the output:</p>
  
  <pre><code>ImportError: No module named httplib2
  2018-01-11 15:23:15.719 main[6162:2128478] main Error
  </code></pre>
  
  <p>Here is how my setup.py is orientated:</p>
  
  <pre><code>from setuptools import setup
  
  APP = ['main.py']
  DATA_FILES = ['auth', 'sales_report']
  OPTIONS = {
      'argv_emulation': True,
      'packages': ['httplib2'],
      'iconfile': 'icon.icns'
  }
  
  setup(
      app=APP,
      data_files=DATA_FILES,
      options={'py2app': OPTIONS},
      setup_requires=['py2app'],
  )
  </code></pre>
  
  <p>I have the library installed, and the script will run fine when put through manually in the terminal. Am I missing something with my setup.py file? Is it referencing from a different site-packages?</p>