You might be interested in the Nix package manager: http://nixos.org/nix/ http://nixos.org/nix/ Among the raft of interesting ideas it brings to the table is a

You might be interested in the Nix package manager: http://nixos.org/nix/ http://nixos.org/nix/ Among the raft of interesting ideas it brings to the table is application sand-boxing; many versions of a shared library can be installed with dependent apps linking against the version they depend on.