I try to clone this repo and run bundle install. The bundle process failed and throw this error:
...
Installing nokogiri 1.6.2.1 with na
Spencer's answer worked for me, but I also needed to use the -n parameter to overcome the permission issue documented here.
So in the end, the command that worked for me was:
gem install -n /usr/local/bin nokogiri -- --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/libxml2 --use-system-libraries