title: Fork loop installing Ruby 1.9.3 using RVM on OS X 10.7
body: <p>When trying to use RVM to install Ruby 1.9.3 on my OS 10.7 MBP, I get an infinite loop as it tries to find another Ruby to do the install:</p>
  
  <pre><code>$ rvm system
  $ rvm install 1.9.3
  Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.7/x86_64/ruby-1.9.3-p448.
  Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
  
  Warning! Requested ruby installation which requires another ruby available - installing one first.
  
  Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.7/x86_64/ruby-2.0.0-p247.
  Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
  
  Warning! Requested ruby installation which requires another ruby available - installing one first.
  
  Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.7/x86_64/ruby-2.0.0-p247.
  Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
  
  Warning! Requested ruby installation which requires another ruby available - installing one first.
  
  Searching for binary rubies, this might take some time.
  No binary rubies available for: osx/10.7/x86_64/ruby-2.0.0-p247.
  Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
  
  Warning! Requested ruby installation which requires another ruby available - installing one first.
  
  Searching for binary rubies, this might take some time.
  ^C
  To proceed rvm requires a ruby-1.9|ruby-2 compatible ruby is installed.
  We attempted to install ruby automatically but it failed.
  Please install it manually (or a compatible alternative) to proceed.
  
  
  To proceed rvm requires a ruby-1.9|ruby-2 compatible ruby is installed.
  We attempted to install ruby automatically but it failed.
  Please install it manually (or a compatible alternative) to proceed.
  
  
  To proceed rvm requires a ruby-1.9|ruby-2 compatible ruby is installed.
  We attempted to install ruby automatically but it failed.
  Please install it manually (or a compatible alternative) to proceed.
  
  
  To proceed rvm requires a ruby-1.9|ruby-2 compatible ruby is installed.
  We attempted to install ruby automatically but it failed.
  Please install it manually (or a compatible alternative) to proceed.
  </code></pre>
  
  <p>Of course, there IS a ruby present or we wouldn't have gotten that far:</p>
  
  <pre><code>$ which ruby
  /usr/bin/ruby
  $ ruby -v
  ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin11.0]
  </code></pre>
  
  <p>Any idea what might be causing this, and how to fix?</p>