brew tap homebrew/dupes
brew install libxml2 libxslt
brew install libiconv
bundle config build.nokogiri --with-xslt-dir=/usr/local/opt/libxslt --with-iconv-dir=/usr/local/opt/libiconv --with-xml2-config=/usr/local/opt/libxml2/bin/xml2-config --with-xslt-config=/usr/local/opt/libxslt/bin/xslt-config
bundle install
gem install nokogiri -v 1.6.3.1 -- --with-xslt-dir=/usr/local/opt/libxslt --with-iconv-dir=/usr/local/opt/libiconv --with-xml2-config=/usr/local/opt/libxml2/bin/xml2-config --with-xslt-config=/usr/local/opt/libxslt/bin/xslt-config