If you are developing Rails or Ruby applications, you probably have to install nokogiri at some point. On Mac OS X, this is always a hassle. One that I keep forgetting.

So to stop forgetting, this is my definite guide to installing Nokogiri!

brew install xml2
bundle config build.nokogiri --use-system-libraries --with-xml2-include=/usr/local/opt/libxml2/include/libxml2
bundle install

Enjoy!