The majority of these packages link against non-system libraries, and the ones that don't are there to be linked against by other packages. OS X is unique amon

The majority of these packages link against non-system libraries, and the ones that don't are there to be linked against by other packages. OS X is unique among modern unixes in that absolutely nobody distributes app bundles that have external dependencies on non-system libraries (except for a few that are too freetarded to bundle ffmpeg).