how do I fix errors trying to bundle install nokogiri?

When I attempt to bundle install nokogiri, I get the following message:

/opt/bitnami/ruby/bin/ruby extconf.rb checking for libxml/parser.h... yes checking for libxslt/xslt.h... yes checking for libexslt/exslt.h... yes checking for iconv_open() in iconv.h... no checking for iconv_open() in -liconv... yes checking for xmlParseDoc() in -lxml2... no

libxml2 is missing. please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.

I have libxml2 installed both in /usr/lib and in /opt/bitnami/common/lib. I used 'nm' to confirm that they both define xmlParseDoc().

I ended up reverting to nokogiri 1.4.1 for the time being. Any thoughts or suggestions on how to get the most current nokogiri installed?

Thanks in advance,

Greg Johnson