Update: https://github.com/phracker/MacOSX-SDKs hosts the direct SDK folders already extracted.
- Go to https://developer.apple.com/downloads/index.action and download
Xcode 4.3.3
- After downloading mount the DMG file and navigate to Xcode.app
- Open the application by clicking
Show Package Content
- Navigate to
/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
- Copy the
MacOSX10.6.sdk
folder - Navigate to /Applications/XCode.app and click
Show Package Content
- Navigate to
/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
- Paste the copied
MacOSX10.6.sdk
folder - Restart Xcode
Mac OS X 10.6 SDK should now be available for selection and building.
how about for
MacOSX10.16.sdk
tho