As you can see below, libv8 installs fine, but therubyracer doesn\'t. I\'m using Mac 10.7.4.
~/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1> gem install lib
You can use the Libv8 from the brew instead of the one from gem. You can do that by following commands:
$ gem uninstall libv8 $ brew install v8 $ gem install therubyracer