heroku/heroku-buildpack-php — pull request #74 by buschjost (2014-08-13 13:37:36+00:00)
Title: Make S3 download url customizable through ENV

Allow users with a fork of this build pack to simply change the S3 download url with an Environment variable for easier testing and switches.
So they do not have to change it in master and get merge conflicts when merging upstream changes.