NIXPKG1 http://nix.cs.uu.nl/dist/nix/nixpkgs-0.11/MANIFEST autoconf-2.61 x86_64-linux /nix/store/85rqqyxgi01svnj8bdmz0zbx0dw6a1da-autoconf-2.61.drv /nix/store/b7jdad70ma46c6vpdh9bhg1wgy6i8gp8-autoconf-2.61