anchor.diff: -{ stdenv, pkgconfig, zlib, qtbase, qtsvg, qttools, qtmultimedia, fetchurl }:
  +{ stdenv, pkgconfig, zlib, qtbase, qtsvg, qttools, qtmultimedia, qmakeHook, fetchurl }:
   stdenv.mkDerivation rec {
     name = "chessx-${version}";
     version = "1.3.2";
  
positive.code:    qttools
     qtmultimedia
     zlib
    ];
  
    enableParallelBuilding = true;
  
negative.code:     url = "mirror://sourceforge/chessx/chessx-${version}.tgz";
      sha256 = "b136cf56d37d34867cdb9538176e1703b14f61b3384885b6f100580d0af0a3ff";
    };
    buildInputs = [
     stdenv
     pkgconfig
  