From: Ken Bloom <kbloom@...>
Date: 2008-11-02T14:38:53+09:00
Subject: Different flavors of a gem for different versions of Ruby

I'm updating my SqlStatement gem http://sqlstatement.rubyforge.org/ to be 
compatible with Ruby 1.9, and owing to totally different ways of doing s-
expressions in Ruby 1.8 (which required RubyNode) and 1.9 (which can trap 
the not and != operators as methods, so I can use the interpreter itself 
to generate everything I need in an s-expression), the Ruby 1.9 version 
no longer requires a dependency on RubyNode. In fact, RubyNode doesn't 
exist for 1.9 AFAICT.

Is there a way to do one of the following in RubyGems?
 * create a Ruby 1.8 flavor of the gem and another Ruby 1.9 flavor.
   Preferably, I'd like the gems to have the same name and live side-by
   side on RubyForge.
or
 * Have both versions of the dependencies exist in a single gem,
   but only enforce the RubyNode dependency when the gem is installed on
   Ruby 1.8.

-- 
Chanoch (Ken) Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/