title: Install hpricot on Mac OS X with rvm and brew
body: <p>Having problems installing hpricot on Mac OS X.  I suspect it might be an issue between rvm and brew?</p>
  
  <p>rvm 1.0.5
  brew 0.7</p>
  
  <p>Thoughts?  Suggestions?  Thanks!</p>
  
  <pre><code>$ gem install hpricot
  Building native extensions.  This could take a while...
  ERROR:  Error installing hpricot:
      ERROR: Failed to build gem native extension.
  
  /Users/dhaskin/.rvm/rubies/ruby-1.8.7-p302/bin/ruby extconf.rb
  checking for stdio.h... no
  *** 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.
  
  Provided configuration options:
      --with-opt-dir
      --without-opt-dir
      --with-opt-include
      --without-opt-include=${opt-dir}/include
      --with-opt-lib
      --without-opt-lib=${opt-dir}/lib
      --with-make-prog
      --without-make-prog
      --srcdir=.
      --curdir
      --ruby=/Users/dhaskin/.rvm/rubies/ruby-1.8.7-p302/bin/ruby
  
  
  Gem files will remain installed in /Users/dhaskin/.rvm/gems/ruby-1.8.7-p302/gems/hpricot-0.8.2 for inspection.
  Results logged to /Users/dhaskin/.rvm/gems/ruby-1.8.7-p302/gems/hpricot-0.8.2/ext/fast_xs/gem_make.out
  </code></pre>