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