postmodern/ruby-install — pull request #61 by bkutil (2013-08-02 19:36:23+00:00)
Title: Add support for URLs as -p option values.

Try to download any patches specified via the -p option that start with
http or https and apply them.

So this example from README would really work:

$ ruby-install -p https://raw.github.com/gist/4136373/falcon-gc.diff ruby 1.9.3-p429