title: elisp conditional based on hostname
body: <p>I have a shared .emacs file between different Linux systems.  I would like to execute an expression based on the hostname of the system I'm running:</p>
  
  <pre><code>(color-theme-initialize)  ;; required for Ubuntu 10.10 and above.
  </code></pre>
  
  <p>I suppose one way to avoid checking the hostname would be to factor out the system dependencies from .emacs, but it's been convenient having .emacs in version control.  Alternative suggestions are welcome.</p>