Install Xcode From DVD
Step 1: Insert your OS X DVD or Thumb Drive
Step 2: Locate Xcode.mpkg
Step 3: Double-click Xcode.mkpg
Step 4: Keep on clicking...
Click "Continue" at the Introduction screen. Click "Continue" at the License screen. Click "Agree" in the pop up to agree to the license. Click "Continue" at the Destination Select screen. Click "Continue" at the Installation Type screen. (Don't change the checkboxes.)
Step 5: Click "Install".
Step 6: Click "Close"
Next Step:
Go on to OS X RVM