title: Installation fails for Fiona and Geopandas with GDAL on Python 3.6 on Microsoft Windows OS?
body: <p>I need to install Geopandas which depends on Fiona and GDAL with pip on Python 3.6. I have installed the GDAL library on Python using the wheel file downloaded from <a href="https://www.lfd.uci.edu/~gohlke/pythonlibs/#gdal" rel="nofollow noreferrer">here</a>.</p>
  
  <pre><code>Processing c:\users\_chena\downloads\gdal-2.4.1-cp36-cp36m-win_amd64.whl
  Installing collected packages: GDAL
  Successfully installed GDAL-2.4.1
  </code></pre>
  
  <p>Then I tried to <code>pip3 install geopandas</code>. I encountered the following error:</p>
  
  <pre><code>Collecting geopandas
    Downloading https://files.pythonhosted.org/packages/f0/5d/916b7268ef551fa9647c
  e12220e9a68006374f1ce5b0ddaf1cd0df2880b7/geopandas-0.4.1-py2.py3-none-any.whl (9
  22kB)
      100% |████████████████████████████████| 931kB 4.1MB/s
  Requirement already satisfied: pandas in d:\aaa_workspace\alex\supportsarah\hist
  oricalplanburnwindowsproject\venv\lib\site-packages (from geopandas) (0.24.1)
  Requirement already satisfied: shapely in d:\aaa_workspace\alex\supportsarah\his
  toricalplanburnwindowsproject\venv\lib\site-packages (from geopandas) (1.6.4.pos
  t1)
  Collecting fiona (from geopandas)
    Downloading https://files.pythonhosted.org/packages/41/9d/63696e7b1de42aad294d
  4781199a408bec593d8fdb80a2b4a788c911a33b/Fiona-1.8.6.tar.gz (1.7MB)
      100% |████████████████████████████████| 1.7MB 7.9MB/s
      Complete output from command python setup.py egg_info:
      A GDAL API version must be specified. Provide a path to gdal-config using a GDAL_CONFIG environment variable or use a GDAL_VERSION environment variable.
  
      ----------------------------------------
  Command "python setup.py egg_info" failed with error code 1 in C:\Users\_chena\A
  ppData\Local\Temp\2\pip-install-vy05tre2\fiona\
  </code></pre>
  
  <p>I can't find anywhere that the gdal-data directory is located. Given the error log as such <code>A GDAL API version must be specified. Provide a path to gdal-config using a GDAL_CONFIG environment variable or use a GDAL_VERSION environment variable.</code>, how can I go about setting the GDAL_CONFIG environment variable with the Python GDAL library installed through pip3?</p>