anchor.diff:      mkdir -p src/calibreweb
       mv cps.py src/calibreweb/__init__.py
       mv cps src/calibreweb
  +
  +    substituteInPlace setup.cfg \
  +      --replace "requests>=2.11.1,<2.25.0" "requests" \
  +      --replace "cps = calibreweb:main" "calibre-web = calibreweb:main" \
  +      --replace "PyPDF3>=1.0.0,<1.0.4" "PyPDF3>=1.0.0" \
  +      --replace "unidecode>=0.04.19,<1.3.0" "unidecode>=0.04.19" \
  +      --replace "flask-wtf>=0.14.2,<0.16.0" "flask-wtf>=0.14.2"
     '';
   
     # Upstream repo doesn't provide any tests.
  
positive.code:     flask-babel
      flask_login
      flask_principal
      iso-639
      lxml
      pypdf3
  
negative.code: 
  python3.pkgs.buildPythonApplication rec {
    pname = "calibre-web";
    version = "0.6.14";
  
    src = fetchFromGitHub {
      owner = "janeczku";
      repo = "calibre-web";
      rev = version;
      sha256 = "sha256-rR5pUB3A0WNQxq7ZJ6ykua7hMlzs49aMmVbBUOkOVfA=";
    };
  
    patches = [
      # default-logger.patch switches default logger to /dev/stdout. Otherwise calibre-web tries to open a file relative
  