anchor.diff:  { lib
   , buildPythonPackage
   , coloredlogs
  +, deprecation
   , fetchFromGitHub
   , ghostscript
   , img2pdf
  -, importlib-metadata
   , importlib-resources
   , jbig2enc
  +, packaging
   , pdfminer-six
   , pikepdf
   , pillow
  
positive.code:   ];
  
    nativeBuildInputs = [
      setuptools-scm-git-archive
      setuptools-scm
      installShellFiles
    ];
  
    propagatedBuildInputs = [
      coloredlogs
      img2pdf
      pdfminer-six
      pikepdf
      pillow
      pluggy
      reportlab
      tqdm
    ] ++ (lib.optionals (pythonOlder "3.8") [
      importlib-metadata
    ]) ++ (lib.optionals (pythonOlder "3.9") [
      importlib-resources
    ]);
  
    checkInputs = [
      pytest-xdist
  
negative.code:     postFetch = ''
        rm "$out/.git_archival.txt"
      '';
      hash = "sha256-eYn24FkAXj/ESCoC0QaLY+wRhkxZP1KnuY4VU1WiG24=";
    };
  
    SETUPTOOLS_SCM_PRETEND_VERSION = version;
  