anchor.diff:  let
     unwrapped = mkDerivation rec {
       pname = "vapoursynth-editor";
  -    version = "R19";
  +    version = "R19-mod-4";
   
  -    src = fetchFromBitbucket {
  -      owner = "mystery_keeper";
  +    src = fetchFromGitHub {
  +      owner = "YomikoR";
         repo = pname;
         rev = lib.toLower version;
  -      sha256 = "1zlaynkkvizf128ln50yvzz3b764f5a0yryp6993s9fkwa7djb6n";
  +      sha256 = "sha256-+/9j9DJDGXbuTvE8ZXIu6wjcof39SyatS36Q6y9hLPg=";
       };
   
       nativeBuildInputs = [ qmake ];
  
positive.code: 
      meta = with lib; {
        description = "Cross-platform editor for VapourSynth scripts";
        homepage = "https://bitbucket.org/mystery_keeper/vapoursynth-editor";
        license = licenses.mit;
        maintainers = with maintainers; [ tadeokondrak ];
        platforms = platforms.all;
  
negative.code: { lib, mkDerivation, fetchFromGitHub, makeWrapper, runCommand
  , python3, vapoursynth
  , qmake, qtbase, qtwebsockets
  }:
  