OS X Lion, Attempting Nokogiri install – libxml2 is missing

$ brew install libxml2 libxslt libiconv
$ sudo gem install nokogiri -v '1.6.5' -- --use-system-libraries --with-xml2-include=/usr/include/libxml2 --with-xml2-lib=/usr/lib

http://stackoverflow.com/questions/9134423/os-x-lion-attempting-nokogiri-install-libxml2-is-missing