{ pkgs ? (import <nixpkgs> {}), stdenv ? pkgs.stdenv, bison ? pkgs.bison, binutils ? pkgs.binutils, fetchurl ? pkgs.fetchurl}: stdenv.mkDerivation rec {  name = "myrddin";   src = ../..;   buildInputs = [ bison binutils ];   preBuild = ''    make bootstrap  '';   postPatch = ''    substituteInPlace "mbld/opts.myr" --replace '"ld"' '"${binutils}/bin/ld"'    substituteInPlace "configure"     --replace '"ld"' '"${binutils}/bin/ld"'    substituteInPlace "mbld/opts.myr" --replace '"as"' '"${binutils}/bin/as"'    substituteInPlace "configure"     --replace '"as"' '"${binutils}/bin/as"'  '';}