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