Rails 3 user to Rails 2: Installing gems without a gemfile?

I'm familiar with Rails 3, but not rails 2. I've just inherited a rails 2 project with no Gemfile, but a bunch of config.gem lines in config/environment.rb

I'm just wondering ho开发者_开发知识库w I to install these. bundle install returns Could not locate Gemfile.

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You can install gems in rails 2.x by using the rake command

   rake gems:install

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You can use bundle install if you use this guide:

http://gembundler.com/rails23.html

To have "backwards" compatibility for bundler.