anchor.diff:    CALIBRE_PY3_PORT = builtins.toString pypkgs.isPy3k;
   
     buildInputs = [
  -    poppler_utils libpng imagemagick libjpeg
  -    fontconfig podofo qtbase chmlib icu sqlite libusb1 libmtp xdg_utils
  -  ] ++ (with pypkgs; [
  -    apsw cssselect css-parser dateutil dnspython feedparser html5-parser lxml markdown netifaces pillow
  -    python pyqt5_with_qtwebkit sip
  -    regex msgpack beautifulsoup4 html2text
  -    # the following are distributed with calibre, but we use upstream instead
  -    odfpy
  -  ]) ++ lib.optionals (!pypkgs.isPy3k) (with pypkgs; [
  -    mechanize
  -  ]);
  +    poppler_utils
  +    libpng
  +    imagemagick
  +    libjpeg
  +    fontconfig
  +    podofo
  +    qtbase
  +    chmlib
  +    icu
  +    hunspell
  +    hyphen
  +    sqlite
  +    libusb1
  +    libmtp
  +    xdg_utils
  +  ] ++ (
  +    with pypkgs; [
  +      apsw
  +      cssselect
  +      css-parser
  +      dateutil
  +      dnspython
  +      feedparser
  +      html5-parser
  +      lxml
  +      markdown
  +      netifaces
  +      pillow
  +      python
  +      pyqt5_with_qtwebkit
  +      sip
  +      regex
  +      msgpack
  +      beautifulsoup4
  +      html2text
  +      # the following are distributed with calibre, but we use upstream instead
  +      odfpy
  +    ]
  +  ) ++ lib.optionals (!pypkgs.isPy3k) (
  +    with pypkgs; [
  +      mechanize
  +    ]
  +  );
   
     installPhase = ''
       runHook preInstall
  
positive.code: in
  mkDerivation rec {
    pname = "calibre";
    version = "3.48.0";
  
    src = fetchurl {
      url = "https://download.calibre-ebook.com/${version}/${pname}-${version}.tar.xz";
      sha256 = "034m89h7j2088p324i1kya33dfldmqyynjxk3w98xiqkz7q2hi82";
    };
  
    patches = [
  
negative.code: { lib
  , mkDerivation
  , fetchurl
  , poppler_utils
  , pkgconfig
  , libpng
  , imagemagick
  , libjpeg
  , fontconfig
  , podofo
  , qtbase
  , qmake
  , icu
  , sqlite
  , hunspell
  , hyphen
  , unrarSupport ? false
  , chmlib
  , python2Packages
  , libusb1
  , libmtp
  , xdg_utils
  , makeDesktopItem
  , removeReferencesTo
  }:
  
  let
  