How to create a rails project using rails/master (beta 4.0.0)?

How can I create a rails project using rails/master?

rails new app_name --edge uses Rails 3.2.8 and points to the '3-2-stable' branch in the Gemfile.

Creating a rails project, pointing gem 'rails' to master and running bundle or bundle install generates several errors. I am also weary of this approach because the rails new command for each version can vary.


Just download the head from github and run it from there:

$ gem update bundler #unless you've got 1.2 already

$ git clone
$ ruby rails/railties/bin/rails new fooapp --dev
$ rails -v
Rails 4.0.0.beta

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