NIXPKG1 http://nixos.org/releases/nixpkgs/nixpkgs-0.12/MANIFEST bison-2.4.1 x86_64-linux /nix/store/h62m5wyc92ld7dsf05acjkav2sqqrb1r-bison-2.4.1.drv /nix/store/85r4rcbczvgk6krwr7xix9kw6ks368iq-bison-2.4.1