title: Libxml2 missing mac os x 10.10
body: <pre><code>Running 'compile' for libxslt 1.1.28... OK
  Running 'install' for libxslt 1.1.28... OK
  Activating libxslt 1.1.28 (from /Users/Kartik/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/nokogiri-1.6.4.1/ports/x86_64-apple-darwin14.0.0/libxslt/1.1.28)...
  checking for main() in -llzma... yes
  checking for xmlParseDoc() in libxml/parser.h... no
  checking for xmlParseDoc() in -lxml2... no
  checking for xmlParseDoc() in -llibxml2... no
  </code></pre>
  
  <blockquote>
    <p>libxml2 is missing.  Please locate mkmf.log to investigate how it is failing.</p>
  </blockquote>
  
  <pre><code>*** extconf.rb failed ***
  Could not create Makefile due to some reason, probably lack of necessary
  libraries and/or headers.  Check the mkmf.log file for more details.  You may
  need configuration options.
  </code></pre>