Go to https://developer.apple.com/downloads/index.action and download Xcode 4.3.3nAfter downloading mount the DMG file and navigate to Xcode.appnOpen the application by clicking Show Package ContentnNavigate to /Contents/Developer/Platforms/MacOSX.platform/Developer/SDKsnCopy the MacOSX10.6.sdk foldernNavigate to /Applications/XCode.app and click Show Package ContentnNavigate to /Contents/Developer/Platforms/MacOSX.platform/Developer/SDKsnPaste the copied MacOSX10.6.sdk foldernRestart XcodennMac OS X 10.6 SDK should now be available for selection and building.nCopied from this gist
Install Mac OS X 10.6 SDK on Newer Xcode
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