anchor.diff:  
     enableParallelBuilding = true;
   
  -  doCheck = false; # would need pythonPackages.dogTail, which is missing
  -
     meta = with stdenv.lib; {
  -    homepage = https://www.gnome.org/projects/evince/;
  +    homepage = https://wiki.gnome.org/Apps/Evince;
       description = "GNOME's document viewer";
   
       longDescription = ''
  
positive.code: { fetchurl, stdenv, pkgconfig, intltool, perl, perlXMLParser, libxml2
  , glib, gtk3, pango, atk, gdk_pixbuf, shared_mime_info, itstool, gnome3
  , 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
  , fetchpatch, autoreconfHook
  }:
  
  stdenv.mkDerivation rec {
    inherit (import ./src.nix fetchurl) name src;
  
    # missing help for now; fixing the autogen phase seemed too difficult
    postPatch = "sed '/@YELP_HELP_RULES@/d' -i help/Makefile.am";
  
    nativeBuildInputs = [ pkgconfig wrapGAppsHook autoreconfHook/*for patches*/ ];
  
    buildInputs = [
      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
      libsecret librsvg gnome3.adwaita-icon-theme gnome3.dconf
    ] ++ stdenv.lib.optional supportXPS gnome3.libgxps;
  
    configureFlags = [
      "--disable-nautilus" # Do not use nautilus
      "--enable-introspection"
      (if supportXPS then "--enable-xps" else "--disable-xps")
    ];
  
    NIX_CFLAGS_COMPILE = "-I${gnome3.glib.dev}/include/gio-unix-2.0";
  
    preConfigure = with stdenv.lib;
      optionalString doCheck ''
        for file in test/*.py; do
          echo "patching $file"
          sed '1s,/usr,${python},' -i "$file"
        done
      '' + optionalString (recentListSize != null) ''
        sed -i 's/\(gtk_recent_chooser_set_limit .*\)5)/\1${builtins.toString recentListSize})/' shell/ev-open-recent-action.c
        sed -i 's/\(if (++n_items == \)5\(.*\)/\1${builtins.toString recentListSize}\2/' shell/ev-window.c
      '';
  
    preFixup = ''
      gappsWrapperArgs+=(--prefix XDG_DATA_DIRS : "${shared_mime_info}/share")
  
negative.code: 
      license = stdenv.lib.licenses.gpl2Plus;
      platforms = platforms.linux;
      maintainers = gnome3.maintainers ++ [ maintainers.vcunat ];
    };
  }
  