Install Native Ruby Gem in Mountain Lion Preview - @zluIn Preview of OS X Mountain Lion, XCode has been distributed as a .app package verses the traditional installer. Also the Commandline Tools are not installed by default. Commandline Tools contains cc/gcc that you will need. After download the preview of XCode 4.4, drop it to the Application directory. Open XCode and cmd + , to open Preferences panel where you can install Commandline Tools: Now in
