I don't manage to install therubyracer gem on Yosemite 10.10. Here is the log: 11:53 $ gem install libv8 -v '3.16.14.3' -- --with-system-v8 Building native extensions with: '--with-system-v8' This could take a while... Successfully installed libv8-3.16.14.3 Parsing documentation for libv8-3.16.14.3 Installing ri documentation for libv8-3.16.14.3 Done installing documentation for libv8 after 0 seco