title: Rails new GEM_HOME
body: <p>I recently upgraded to Ruby 1.8.7 (had an issue with 1.9.2) and had to reinstall RubyGems.  Now my project can't see any of the old gems in my GEM_HOME, is there a way to point my new gem binary to my previous GEM_HOME?  I can't find anything online and it's a big pain to install them all again one by one.  I'm also on a Mac, so it's at:</p>
  
  <p><code>$ echo $GEM_HOME<br>
  /Library/Ruby/Gems/1.8/gems/</code></p>
  
  <p>Thank you!</p>