title: libxml2 and libxml2-dev on OSX
body: <p>When trying to build the Unix QuickFIX engine, I get the following error after ./bootstrap</p>
  
  <pre><code>warning:macro 'AM_PATH_XML2' not found in library
  </code></pre>
  
  <p>As I understand, libxml2 already comes with XCode OS X Mountain Lion.  An answer I found suggested to download libxml2-dev, although I could not find the package using HomeBrew.<br>
  I'm relatively new to programming on OS X and Xcode and porting Unix applications, so I'm not sure exactly what I have yet.</p>