This is a Heroku buildpack for adding wget to your application.

More likely, you'll want to use it as part of a larger project, which needs to use wget. The easiest way to do this is with a multipack, where this is just one of the buildpacks you'll be working with.

$ cat .buildpacks
git://github.com/heroku/heroku-buildpack-ruby.git
git://github.com/johnbeynon/heroku-buildpack-wget.git

$ heroku config:add BUILDPACK_URL=git://github.com/ddollar/heroku-buildpack-multi.git

This will bundle wget into your instance without impacting your existing system.