anchor.diff:    src = fetchurl {
       url = "http://download.qt-project.org/official_releases/qt/"
         + "${v_maj}/${vers}/qt-everywhere-opensource-src-${vers}.tar.gz";
  -    sha256 = "0b036iqgmbbv37dgwwfihw3mihjbnw3kb5kaisdy0qi8nn8xs54b";
  +    sha256 = "183fca7n7439nlhxyg1z7aky0izgbyll3iwakw4gwivy16aj5272";
     };
   
     # The version property must be kept because it will be included into the QtSDK package name
  
positive.code: 
    nativeBuildInputs = [ perl pkgconfig which ];
  
    # occasional build problems if one has too many cores (like on Hydra)
    # @vcunat has been unable to find a *reliable* fix
    enableParallelBuilding = false;
  
    NIX_CFLAGS_COMPILE = optionalString stdenv.isDarwin
      "-I${glib}/include/glib-2.0 -I${glib}/lib/glib-2.0/include";
  
negative.code: 
  let
    v_maj = "4.8";
    v_min = "7";
    vers = "${v_maj}.${v_min}";
  in
  
  