How to install Nokogiri (Ruby) and lxml (Pyhon) with ease : Install Nokogiri (ruby) gem install nokogiri — –use-system-libraries=true –with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/libxml2 Install lxml (python) brew install libxml2 brew install libxslt brew link libxml2 –force brew link libxslt –force sudo pip install lxml brew unlink libxml2 brew unlink libxslt