anchor.diff:  
     src = fetchurl {
       url = "https://download.kde.org/stable/krita/${major}.${minor}/${name}.tar.gz";
  -    sha256 = "0h2rplc76r82b8smk61zci1ijj9xkjmf20pdqa8fc2lz4zicjxh4";
  +    sha256 = "1l5bhk4b2f3qdzg9jk2sxz2bq8cqs10nm3wgkrkbqs6vig75rsym";
     };
   
     nativeBuildInputs = [ cmake extra-cmake-modules python3Packages.sip makeWrapper ];
  
positive.code:     ki18n kitemmodels kitemviews kwindowsystem kio kcrash
      boost libraw fftw eigen exiv2 lcms2 gsl openexr libheif giflib
      openjpeg opencolorio poppler curl ilmbase
      qtmultimedia qtx11extras
      python3Packages.pyqt5
    ] ++ lib.optional (stdenv.hostPlatform.isi686 || stdenv.hostPlatform.isx86_64) vc;
  
  
negative.code: , kio, kcrash
  , boost, libraw, fftw, eigen, exiv2, libheif, lcms2, gsl, openexr, giflib
  , openjpeg, opencolorio, vc, poppler, curl, ilmbase
  , qtmultimedia, qtx11extras, quazip
  , python3Packages
  }:
  
  let
  
  major = "4.2";
  minor = "0";
  patch = null;
  
  in
  