anchor.diff:      gettext
       libxslt
       desktop-file-utils
  -    docbook_xsl
  +    docbook-xsl-nons
       docbook_xml_dtd_42
       wrapGAppsHook
       python3
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "gnome-books";
    version = "3.34.0";
  
    src = fetchurl {
      url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
      sha256 = "153vknqisjn5f105avzm933fsc3v0pjzzbwxlqxf8vjjksh1cmya";
    };
  
    nativeBuildInputs = [
  
negative.code:   };
  
    meta = with lib; {
      homepage = "https://wiki.gnome.org/Apps/Books";
      description = "An e-book manager application for GNOME";
      maintainers = teams.gnome.members;
  