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