Multi-user and multi-aplication (different applications can depend on different versions of a shared library). Here's another example that's not public, and no

Multi-user and multi-aplication (different applications can depend on different versions of a shared library). Here's another example that's not public, and not really a distro, but... http://stackoverflow.com/questions/3380795/what-does-amazon-use-for-its-build-and-release-system http://stackoverflow.com/questions/3380795/what-does-amazon-...