title: Xcode - Use multiple SDKs on XCode 5
body: <p>I have a project which requires iOS 6.1 SDK and I have upgraded to XCode5 and dont see iOS 6.1 SDK in Build Settings -> Base SDKs. I have earlier SDK saved separately and tried copy-pasting it in /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs Directory. But it doesn't show up in Build settings -> Base SDKS. How can I use multiple SDKs in Xcode 5?</p>