Create rvmrc file:
$ rvm use 1.9.3@yourgemsetname --create --rvmrc
Add bundler to your Rakefile
$:.unshift("/Library/RubyMotion/lib")
require 'motion/project'
require 'bundler'
Bundler.require
#...
Create your Gemfile
via:
$ bundle init
Update your Gemfile
source "https://rubygems.org"
gem "bubble-wrap"
Install gems
$ bundle
You're done.