mobilestack/intall GDAL on MAC.md

## intall GDAL on MAC.md

      
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              intall GDAL on MAC.md
            
          
    from http://www.davidlemayian.com/post/60791205171/how-to-install-python-gdal-on-os-x
intall gdal first and then install GDAL for python
$ brew install gdal
$ sudo pip install GDAL
if GDAL is has cc error, then it is due to xcode5.1, just install GDAL with
ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future ./venv/bin/pip install GDAL