NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST bsdiff-4.2 x86_64-linux /nix/store/fp975hfjdgkn8n2vizyqz8zjv185n3di-bsdiff-4.2.drv /nix/store/xi937ssrm5ng56jq8z1v2f1mi1rqr4la-bsdiff-4.2