title: how to downgrade GDAL to version 2.4?
body: <p>I'm trying to push my django app on heroku and i keep getting this message error.</p>
  <pre><code> An error occurred while installing gdal==3.1.2! Will try again.
  remote:        Installing initially–failed dependencies…
  remote:        Collecting gdal==3.1.2
  </code></pre>
  <p>... and</p>
  <pre><code> Traceback (most recent call last):
  remote:              File &quot;/tmp/pip-build-oj843jp_/gdal/setup.py&quot;, line 257, in get_gdal_config
  remote:                return fetch_config(option)
  remote:              File &quot;/tmp/pip-build-oj843jp_/gdal/setup.py&quot;, line 154, in fetch_config
  remote:                raise gdal_config_error(e)
  remote:            gdal_config_error: [Errno 2] No such file or directory: 'gdal-config'
  remote:
  remote:            Could not find gdal-config. Make sure you have installed the GDAL native library and development headers.
  </code></pre>
  <p>I think this is happening because i updated the GDAL because of a previous error message and seems that django only support the version 2.4.</p>
  <p>i download the 2.4.3 version files and i can't find the command to install it.
  i tried pip install gdal==2.4.3  still not working.</p>
  <p>I can't get the proper steps to get the right version. Can anyone point me into the right direction?
  I'm using a mac catalina</p>