This is a Heroku buildpack that vendors main geo/gis libraries like geos, proj and gdal.
It is meant to be used in conjunction with other buildpacks as part of a multi-buildpack.
Example usage:
$ heroku config:add BUILDPACK_URL=https://github.com/ddollar/heroku-buildpack-multi.git
$ cat .buildpacks
https://github.com/cyberdelia/heroku-geo-buildpack.git#1.0
https://github.com/heroku/heroku-buildpack-ruby.git#v79
Don't forget to pin buildpack versions you want to use in your .buildpacks file.