Xcode 4.0 drops support for many older systems, including all PowerPC development and software development kits (SDKs) for Mac OS X 10.4 and 10.5, and all iOS SDKs older than 4.3.
Xcode 4.0 je otkazao podršku za mnoge starije sisteme, uključujući celokupan razvoj PowerPC-ja i softverskih razvojnih alata (SDK) za Mac OS X 10.4 i 10.5 i za sve iOS SDK starije od 4.3.