also
http://docs.rubygems.org/read/book/3

RubyGems is a system that aims to provide the following (it is still in
development):
A development framework that allows developers working on pure-Ruby
projects to packages those projects into a single file that contains
their source files as well as metadata describing the project. This
metadata includes the name for the project, the author's name, a
category, a version, a description, and even dependencies the project
has.
Also, locale metadata as in: lang=en, country=us, charset=us-ascii
[HoracioLopez vruz]

it would be install, include is for ruby programs I would think.

http://docs.rubygems.org/read/chapter/19
see if any of this might be your problem. Do you have several ruby
installed? On the
mac for example, Ruby comes pre installed.

how about this? could that help? says it is for windows
http://instantrails.rubyforge.org/wiki/wiki.pl
how about this
http://blog.leetsoft.com/articles/2005/06/17/installing-rails-made-easy
http://home.leetsoft.com/dropbox/private-ruby/install
It is not up to date, apparently some directory has changed, but it
shows how
someone thinks it should work.