anchor.diff:        wrapProgram $a --prefix PYTHONPATH : $PYTHONPATH \
                        --prefix PATH : ${poppler_utils.out}/bin
       done
  +
  +    # Replace @out@ by the output path.
  +    mkdir -p $out/share/applications/
  +    cp {$calibreDesktopItem,$ebookEditDesktopItem,$ebookViewerDesktopItem}/share/applications/* $out/share/applications/
  +    for entry in $out/share/applications/*.desktop; do
  +      substituteAllInPlace $entry
  +    done
     '';
  +
  +  calibreDesktopItem = makeDesktopItem {
  +    name = "calibre";
  +    desktopName = "calibre";
  +    exec = "@out@/bin/calibre --detach %F";
  +    genericName = "E-book library management";
  +    icon = "@out@/share/calibre/images/library.png";
  +    comment = "Manage, convert, edit, and read e-books";
  +    mimeType = stdenv.lib.concatStringsSep ";" [
  +      "application/x-mobipocket-subscription"
  +      "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
  +      "text/html"
  +      "application/x-cbc"
  +      "application/ereader"
  +      "application/oebps-package+xml"
  +      "image/vnd.djvu"
  +      "application/x-sony-bbeb"
  +      "application/vnd.ms-word.document.macroenabled.12"
  +      "text/rtf"
  +      "text/x-markdown"
  +      "application/pdf"
  +      "application/x-cbz"
  +      "application/x-mobipocket-ebook"
  +      "application/x-cbr"
  +      "application/x-mobi8-ebook"
  +      "text/fb2+xml"
  +      "application/vnd.oasis.opendocument.text"
  +      "application/epub+zip"
  +      "text/plain"
  +      "application/xhtml+xml"
  +    ];
  +    categories = "Office";
  +    extraEntries = ''
  +      Actions=ebook-edit ebook-viewer
  +
  +      [Desktop Action ebook-edit]
  +      Name=Edit E-book
  +      Icon=@out@/share/calibre/images/tweak.png
  +      Exec=@out@/bin/ebook-edit --detach %F
  +
  +      [Desktop Action ebook-viewer]
  +      Name=E-book Viewer
  +      Icon=@out@/share/calibre/images/viewer.png
  +      Exec=@out@/bin/ebook-viewer --detach %F
  +    '';
  +  };
  +
  +  ebookEditDesktopItem = makeDesktopItem {
  +    name = "calibre-edit-ebook";
  +    desktopName = "Edit E-book";
  +    genericName = "E-book Editor";
  +    comment = "Edit e-books";
  +    icon = "@out@/share/calibre/images/tweak.png";
  +    exec = "@out@/bin/ebook-edit --detach %F";
  +    categories = "Office;Publishing";
  +    mimeType = "application/epub+zip";
  +    extraEntries = "NoDisplay=true";
  +  };
  +
  +  ebookViewerDesktopItem = makeDesktopItem {
  +    name = "calibre-ebook-viewer";
  +    desktopName = "E-book Viewer";
  +    genericName = "E-book Viewer";
  +    comment = "Read e-books in all the major formats";
  +    icon = "@out@/share/calibre/images/viewer.png";
  +    exec = "@out@/bin/ebook-viewer --detach %F";
  +    categories = "Office;Viewer";
  +    mimeType = "application/epub+zip";
  +    extraEntries = "NoDisplay=true";
  +  };
   
     meta = with stdenv.lib; {
       description = "Comprehensive e-book software";
  -    homepage = http://calibre-ebook.com;
  +    homepage = https://calibre-ebook.com;
       license = with licenses; if unrarSupport then unfreeRedistributable else gpl3;
       maintainers = with maintainers; [ viric domenkozar pSub AndersonTorres ];
       platforms = platforms.linux;
  
positive.code:   name = "calibre-${version}";
  
    src = fetchurl {
      url = "http://download.calibre-ebook.com/${version}/${name}.tar.xz";
      sha256 = "0npqvfjqj1vwa7nmnsyd4d30z40brydw275ldf1jankrp6dr9dyd";
    };
  
  
negative.code: { stdenv, fetchurl, python, pyqt5, sip_4_16, poppler_utils, pkgconfig, libpng
  , imagemagick, libjpeg, fontconfig, podofo, qtbase, qmakeHook, icu, sqlite
  , makeWrapper, unrarSupport ? false, chmlib, pythonPackages, xz, libusb1, libmtp
  , xdg_utils, makeDesktopItem
  }:
  
  stdenv.mkDerivation rec {
  