* ruby >= 1.8.6
* libxml (http://xmlsoft.org/)
* libxml-ruby installed via gem (i.e. "gem install libxml-ruby")
* xml-mapping installed via gem (i.e. "gem install xml-mapping")
* activerecord installed via gem (i.e. "gem install activerecord") for ActiveVotable
* activesupport installed via gem (i.e. "gem install activesupport") for ActiveVotable