When trying to install therubyracer on OSX 10.9, with the command:
$ gem install therubyracer -v \'0.12.0\'
I get the error:
Delete /Users/doved/.rvm/gems/ruby-2.0.0-p353/cache/therubyracer-0.12.0.gem and install the gem again. RubyGems didn't download the file properly, and the system is properly reporting that the gem is corrupted.