CRITICAL:root:A GDAL API version must be specified.

When I try to install label_maker, with the following commanbd:
`pip install --user label_maker`
and it stop with the following error:

```
INFO:root:Building on Windows requires extra options to setup.py to locate needed GDAL files. More information is available in the README.
CRITICAL:root: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\o0331\AppData\Local\Temp\pip-install-foil9_5w\rasterio\
```
I have my GDAL installed in
`"C:\Program Files\Python36\Lib\site-packages\GDAL-2.2.4.dist-info"`
Not sure how to specify the path. Tried
`pip install --user label_maker GDAL_CONFIG="C:\Program Files\Python36\Lib\site-packages\GDAL-2.2.4.dist-info"`
but it showed me
```
Invalid requirement: 'GDAL_CONFIG=C:\Program Files\Python36\Lib\site-packages\GDAL-2.2.4.dist-info'
It looks like a path. File 'GDAL_CONFIG=C:\Program Files\Python36\Lib\site-packages\GDAL-2.2.4.dist-info' does not exist.
```
My OS is Windows 10 version 1803 and use native Python 3.6.6 installation (without conda).