Step 1: Setup your Ruby 1.9.2-head
$ rvm 1.9.2-head
WARN: ruby ruby-1.9.2-head is not installed.To install do: ‘rvm install ruby-1.9.2-head’
Step 2: Install the utilities need to build the head
$ sudo apt-get install bison
$ sudo apt-get install autoconf
Step 3: Install your Ruby 1.9.2-head
$ rvm install ruby-1.9.2-head
Step 4: Create your new GemSet
$ rvm gemset create corerivalry

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