title: Error when executing rvm rubygems latest
body: <p>I'm adding ruby 1.9.2 to a Mac running 10.6.8 and hitting a problem with <em>rvm rubygems latest</em>. I've run the following with no problem:</p>
  
  <pre><code>$ rvm install 1.9.2
  $ rvm use 1.9.2
  $ ruby --version
  ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]
  </code></pre>
  
  <p>Then hit this error:</p>
  
  <pre><code>$ rvm rubygems latest
  Removing old Rubygems files...
  Installing rubygems-1.8.10 for system ...
  ERROR: Error running 'GEM_PATH=":@global" GEM_HOME="" "/usr/local/rvm/rubies//bin/ruby" "/usr/local/rvm/src/rubygems-1.8.10/setup.rb"', please read /usr/local/rvm/log/system/rubygems.install.log
  WARN: Installation of rubygems did not complete successfully.
  ln: /usr/local/rvm/rubies//lib/ruby/gems/: No such file or directory
  </code></pre>
  
  <p>The obvious thing here is the extra forward-slash in the bin/ruby and lib/ruby paths. Any ideas where this is coming from and how to fix it?</p>
  
  <p>Note that I've also got the following line at the end of my .bash_profile file:</p>
  
  <pre><code>[[ -s "$HOME/.rvm/scripts/rvm" ]] &amp;&amp; . "$HOME/.rvm/scripts/rvm" # Load RVM function
  </code></pre>
  
  <p>I'm doing all of this so that I can run Octopress. I've also got a Rails 2.3.8 project that I am developing on this same machine. This is the first time I've dealt with anything other then the system version of ruby (1.8.7).</p>