The dependency map of the program you're running states which one takes precedence and gets mapped (overlay-mounted, to be more precise) to /System/Index/bin.

The dependency map of the program you're running states which one takes precedence and gets mapped (overlay-mounted, to be more precise) to /System/Index/bin. So, a dependency map that contains "Foo = 1.0" would cause Foo/1.0/bin/uninstall.sh to be the one mapped to /System/Index/bin.