title: ruby-1.9.2 won't install - could not find compiler and 'make' tool
body: <p>Every time I run <code>rvm install ruby-1.9.2-p320</code> I get the following message. </p>
  
  <pre><code>Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.8/x86_64/ruby-1.9.2-p320.
  Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
  Checking requirements for osx.
  Can not find compiler and 'make' tool - make sure Xcode and/or Command Line Tools are installed.
  Requirements installation failed with status: 11.
  </code></pre>
  
  <p>I am just starting to try to learn to program and I understand I need to be able to install and run different versions of ruby other than the default 1.8.something. I have close to no idea what I am doing so please dumb-down any answer. Thanks in advance.</p>