anchor.diff:  
     nativeBuildInputs = [
       appstream
  -    docbook-xsl-nons
  -    docbook_xml_dtd_43
       gettext
       gobject-introspection
  -    gtk-doc
  +    gi-docgen
       itstool
       meson
       ninja
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "evince";
    version = "41.4";
  
    outputs = [ "out" "dev" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/evince/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "/yRSQPIwkivsMqTXsKHZGyR6g9E0hPmbdANdUesjITA=";
    };
  
    patches = lib.optionals withPantheon [
  
negative.code:     libxml2
      pango
      poppler
      texlive.bin.core # kpathsea for DVI support
    ] ++ lib.optionals withLibsecret [
      libsecret
  