title: Gem install ruby-opengl on Mac OSX Lion
body: <p>When I try to install the gem <strong>ruby-opengl</strong> on Mac OSX Lion it doesn't work.
  I obtain a huge error message which the end is :</p>
  
  <pre><code>fatal error: too many errors emitted, stopping now [-ferror-limit=]
  20 errors generated.
  rake aborted!
  Command failed with status (1): [clang -fno-common  -O3 -ggdb -Wextra -Wno-...]
  
  Tasks: TOP =&gt; default =&gt; gl.bundle =&gt; gl-1.0-1.1.o
  (See full trace by running task with --trace)
  rake aborted!
  Command failed with status (1): [rake...]
  
  Tasks: TOP =&gt; default =&gt; gl =&gt; ext/gl/gl.bundle
  (See full trace by running task with --trace)
  </code></pre>
  
  <p>Anybody have an idea to fix this ? </p>