NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST autoconf-2.63 x86_64-linux /nix/store/zm5swf0hi93dycc9jinfq9dxjph7n27q-autoconf-2.63.drv /nix/store/b80kh08lq1lnf12yq9w852ha62vmgs6m-autoconf-2.63