anchor.diff:    # hack around a make problem, see https://github.com/NixOS/nixpkgs/issues/1279#issuecomment-29547393
     preBuild = "touch -- {.,shell,jsapi-tests}/{-lpthread,-ldl}";
   
  +  enableParallelBuilding = true;
  +
     doCheck = true;
     preCheck = "rm jit-test/tests/sunspider/check-date-format-tofte.js"; # https://bugzil.la/600522
   
  
positive.code: { stdenv, fetchurl, pkgconfig, nspr, perl, python, readline, zip }:
  
  stdenv.mkDerivation rec {
    version = "185-1.0.0";
  
negative.code: 
    propagatedBuildInputs = [ nspr ];
  
    buildInputs = [ pkgconfig perl python zip ];
  
    postUnpack = "sourceRoot=\${sourceRoot}/js/src";
  
  