I\'ve just updated to OS X Mountain Lion and I\'m getting the following when working with rails and terminal.
WARNING: Nokogiri was built against LibXML vers
After upgrading ruby-build
brew update brew upgrade ruby-build
I just reinstalled ruby (last version)
rbenv install 1.9.3-p194
and then I installed all the gems related to my project including nokogiri without having further problems.
gem install bundler bundle