{ pkgs ? import <nixpkgs> {} }: with pkgs; let mkVersion = version: sha256: stdenv.mkDerivation { name = "dhall-${version}"; inherit version; src = fetchurl { url = "https://github.com/dhall-lang/dhall-haskell/releases/download/${version}/dhall-${version}-x86_64-linux.tar.bz2"; inherit sha256; }; unpackPhase = '' tar -xjf $src ''; installPhase = '' mkdir -p $out/bin mv bin/dhall $out/bin/ ''; }; in mkVersion "1.21.0" "0x7q6v1y62fq6724kx1hcfp1fcqv3lbv33ji6jzfd5y316a31r77"