title: problem using py2app to compile python files doesn't work anymore
body: <p>I am using py2app to compile python files into .app . I'm on macOS and using python 3.8.9. Some weeks ago it used to work just fine, but now whenever I try to use it I get this error</p>
  <p><code>error: [Errno 2] /Library/Python/3.8/include/pyconfig.h: 'No such file or directory'</code></p>
  <p>I've searched for answers but it only appears to happen to users on Ubuntu.</p>
  <p>This is my setup.py file</p>
  <pre><code>from setuptools import setup
  
  APP=[&quot;test.py&quot;]
  OPTIONS= {
      'iconfile':'iconapp.icns',
      'argv_emulation': True,
  }
  
  setup(
      app=APP,
      options={'py2app': OPTIONS},
      setup_requires=['py2app'],
  )
  
  </code></pre>
  <p>Should I provide more info?</p>