Installing libv8 on Mac OS

Problem:

xcode-select: Error: No Xcode folder is set. Run xcode-select -switch to set the path to the Xcode folder.

Resolution:

xcode-select --print-path
sudo xcode-select -switch /Developer-3.2.6/Applications/Xcode.app/Contents/MacOS/
gem install therubyracer -v 0.12.2