Problem installing rasterio package in python 64-bit (for Windows). Error as below,

```

Collecting rasterio

Downloading rasterio-1.2.6.tar.gz (2.2 MB)

|████████████████████████████████| 2.2 MB 1.7 MB/s

Installing build dependencies ... done

Getting requirements to build wheel ... error

ERROR: Command errored out with exit status 1:

command: 'C:\Users\python.exe' 'C:\Users\lib\site-packages\pip\_vendor\pep517\in_process\_in_process.py' get_requires_for_build_wheel 'C:\Users\AppData\Local\Temp\tmpp3fg7w7t'

cwd: C:\AppData\Local\Temp\pip-install-glq6gi3q\rasterio_6efe417705614a89a60e562846308cfa

Complete output (2 lines):

INFO:root:Building on Windows requires extra options to setup.py to locate needed GDAL files. More information is available in the README.

ERROR: 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.

```

I got the same error for rasterio versions 1.2.6 to 1.0.26.

Any help in installing rasterio package for windows is much appreciated.

Thanks!