Indeed I can do that. This brings up another question; since frameworks and libs didn't have much 64 bit support in 10.4, is it possible for a fat binary to load the 64 bit image on 10.5 and 32 bit on 10.4? Perhaps with some Info.plist settings. My instinct says no; 64 bit image will be used on all 64 bit archs regardless of sys version.

On Apr 10, 2008, at 5:31 PM, Clark Cox wrote:

Are you sure that you have to use the 10.4 SDK? Just use the 10.5 SDK,
but set the deployment target to 10.4 for your 32-bit architectures.

Alternatively, you could probably use different SDK's for different
architectures. Your i386 and/or ppc builds can use the 10.4 SDK, while
your x86_64 and/or ppc64 builds can use the 10.5 SDK.

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