[CMake] find_library and mac os x SDKs

[Simmons, Aaron]

>What I don't understand is this: Why do you want to force the SDK? Shouldn't this be the worry of the person doing the build?
>
>If I download some open-source software and then build it for myself, 
>I don't want to be forced in using the 10.4 SDK, I wan't to build against the greatest and latest!

If this were open-source, I'd agree with you.  But it's not-- it's the build script for my company's software that needs to run on 10.4.  I suppose I could have cmake try for the 10.4 sdk if it's available or use the default otherwise.  But since it's a requirement that it work on 10.4, I'd rather have it always build that way.


aaron