This buildpack only installs wkhtmltopdf, it isn't very useful by itself.
$ heroku buildpacks:set 'https://github.com/COMPEON/heroku-buildpack-wkhtmltopdf.git'
If you run into issues when trying to deploy with this buildpack, make sure your
app is running on
heroku-16. You can check this with:
$ heroku stack
Copy the snippet above into CLI.