title: heroku push rejected due to gdal library
body: <p>I wanted to deploy my application in heroku. The platform I am using are<code>django 1.11, django-rest-framework, postgresql, gis</code>. When I do <code>git push heroku master</code>, I get the following error</p>
  
  <blockquote>
    <p>django.core.exceptions.ImproperlyConfigured: Could not find the GDAL
    library (tried "gdal", "GDAL", "gdal2.1.0", "gdal2.0.0", "gdal1.11.0",
    "gdal1.10.0", "gdal1.9.0"). Is GDAL installed? If it is, try setting
    GDAL_LIBRARY_PATH in your settings.</p>
  </blockquote>
  
  <p>It says to install GDAL and provide GDAL_LIBRARY_PATH. How do i provide the path for it? </p>
  
  <p>I have also configured for postgresql </p>
  
  <pre><code>heroku addons:create heroku-postgresql:hobby-dev
  </code></pre>