anchor.diff:  
     preConfigure = ''
       substituteInPlace setup.py \
  -      --replace 'requests>=2.24.0' 'requests~=2.23' \
  -      --replace 'beautifulsoup4==4.9.1' 'beautifulsoup4~=4.9' \
  -      --replace 'colorama==0.4.3' 'colorama~=0.4' \
  -      --replace 'unidecode==1.1.1' 'unidecode~=1.2'
  +      --replace 'beautifulsoup4==4.9.3' 'beautifulsoup4>=4.9.3' \
  +      --replace 'unidecode==1.2.0' 'unidecode>=1.2.0' \
  +      --replace 'flask==2.0.1' 'flask>=2.0.1'
     '';
   
     preBuild = "export HOME=$NIX_BUILD_TOP";
  
positive.code:     homepage = "https://github.com/SwagLyrics/SwagLyrics-For-Spotify";
      license = licenses.mit;
      maintainers = with maintainers; [ siraben ];
      platforms = platforms.linux;
    };
  }
  
negative.code: 
  python3.pkgs.buildPythonApplication rec {
    pname = "swaglyrics";
    version = "unstable-2021-06-17";
  
    src = fetchFromGitHub {
      owner = "SwagLyrics";
      repo = "SwagLyrics-For-Spotify";
      rev = "99fe764a9e45cac6cb9fcdf724c7d2f8cb4524fb";
      sha256 = "sha256-O48T1WsUIVnNQb8gmzSkFFHTOiFOKVSAEYhF9zUqZz0=";
    };
  
    propagatedBuildInputs = with python3.pkgs; [
  