How do I add conditional rubygem requirements to a gem specification?

Question

Is it possible to add a gem dependency only if the person is using a certain version of ruby?

Background: I\'m working on a fork of a project that u

Answer 1

You can't. You need to build two gems, one with

spec.required_ruby_version = '~> 1.8.6'

and one with

spec.required_ruby_version = '~> 1.9.1'
spec.add_dependency 'test-unit', '~> 2.0.5'