RevoBoot can now be built with Xcode 4.5.1 on Mountain Lion. See change log for instructions. Please note that RevoBoot must be configured for your hardware so start reading our WiKi. See also: https://github.com/blackosx/RevoBuilder/wiki/Using-RevoBuilder We also have a configuration README available at: https://github.com/RevoGirl/RevoBoot/blob/master/i386/config/README There's also RevoBuilder (a great tool for first starters) over at: https://github.com/blackosx/RevoBuilder/wiki/Using-RevoBuilder