anchor.diff:  { fetchurl, stdenv, pkgconfig, intltool, perl, perlXMLParser, libxml2
   , glib, gtk3, pango, atk, gdk_pixbuf, shared_mime_info, itstool, gnome3
  -, poppler, ghostscriptX, djvulibre, libspectre, libsecret , makeWrapper
  +, poppler, ghostscriptX, djvulibre, libspectre, libsecret , wrapGAppsHook
   , librsvg, gobjectIntrospection
   , recentListSize ? null # 5 is not enough, allow passing a different number
   , supportXPS ? false    # Open XML Paper Specification via libgxps
  
positive.code: stdenv.mkDerivation rec {
    inherit (import ./src.nix fetchurl) name src;
  
    buildInputs = [
      pkgconfig intltool perl perlXMLParser libxml2
      glib gtk3 pango atk gdk_pixbuf gobjectIntrospection
      itstool gnome3.adwaita-icon-theme
      gnome3.libgnome_keyring gnome3.gsettings_desktop_schemas
      poppler ghostscriptX djvulibre libspectre
      makeWrapper libsecret librsvg gnome3.adwaita-icon-theme
    ] ++ stdenv.lib.optional supportXPS gnome3.libgxps;
  
    configureFlags = [
  
negative.code:       sed -i 's/\(if (++n_items == \)5\(.*\)/\1${builtins.toString recentListSize}\2/' shell/ev-window.c
      '';
  
    doCheck = false; # would need pythonPackages.dogTail, which is missing
  
    meta = with stdenv.lib; {
  