title: trouble installing rvm
body: <p>So I am trying to install RVM, but I think there is a conflict with Xcode on my mac computer. I used to run <code>rvm install ruby-1.9.2-p320</code>
  and  this was my error
  The provided compiler </p>
  
  <pre><code>'/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
  </code></pre>
  
  <p>I then read a solution to write <code>rvm get head</code> and its successful, but when I run rvm install ruby-1.9.2-p320 again, I get this error.</p>
  
  <pre><code>No binary rubies available for: ///ruby-1.9.2-p320.
  Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
  The provided compiler '/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
  'rvm_codesign_identity' is not set, please set it in ~/.rvmrc
  </code></pre>