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
It seems like this has been fixed upstream. What worked for me and @aurels and @Mike Causer and @Juanda was:
bundle update libv8