First you will need an old version of the OSX SDK. Apple in their wisdom do not do these as a separate download, but bundle the SDK's with a version of xcode, which I think was 4.3 at that time for 10.6. Once you had the SDK installed. All you had to do then was open the xcode project file and change the Base SDK settings. But as the tool chain and the SDK's have changed somewhat, you will encounter issues getting the older SDK to work with a newer version of xcode. I would suggest that you have a good google around to see if there are any easy solutions out there.
|