Mac OS X executables of A1 starting at least from v1.0.0 have the 'SDL.framework' component 3x the normal size (the release version of 'SDL.framework' should be ~2 MB in size instead of ~6 MB now).
Obviously, certain files/folders are duplicated during packaging/deployment stage because of an incorrect Xcode setting.
Instead they should be symlink'ed, 'SDL.framework' would then conform to the structure of an OS X framework:
(inside Marathon.app bundle)
Contents
Frameworks
SDL.framework
Headers <-- must be symlink
Resources <-- must be symlink
SDL <-- must be symlink
Versions
A
Current <-- must be symlink
The /Library/Framework/SDL.framework on my build machine is incorrect in the same way!
I suspect the Xcode settings are correct, because the other frameworks copy correctly.
Aleph One 1.2 (20150619) has a copy of SDL.framework with symlinks instead of duplicate files.