anchor.diff:      done
     '';
   
  +  passthru = {
  +    updateScript = gnome3.updateScript {
  +      packageName = "evolution-data-server";
  +    };
  +  };
  +
     meta = with stdenv.lib; {
  +    description = "Unified backend for programs that work with contacts, tasks, and calendar information";
  +    homepage = https://wiki.gnome.org/Apps/Evolution;
       license = licenses.lgpl2;
       maintainers = gnome3.maintainers;
       platforms = platforms.linux;
  
positive.code: { fetchurl, stdenv, pkgconfig, gnome3, python3, dconf
  , intltool, libsoup, libxml2, libsecret, icu, sqlite
  , p11-kit, db, nspr, nss, libical, gperf, makeWrapper, valaSupport ? true
  , vala, cmake, ninja, kerberos, openldap, webkitgtk, libaccounts-glib, json-glib }:
  
  stdenv.mkDerivation rec {
    name = "evolution-data-server-${version}";
    version = "3.28.0";
  
    src = fetchurl {
      url = "mirror://gnome/sources/evolution-data-server/${gnome3.versionBranch version}/${name}.tar.xz";
      sha256 = "1ybyyy6nls11az8lbri1y9527snz5h7qbhyfqvk0vc6vzvald5gv";
    };
  
    passthru = {
      updateScript = gnome3.updateScript { packageName = "evolution-data-server"; };
    };
  
    nativeBuildInputs = [
      cmake ninja pkgconfig intltool python3 gperf makeWrapper
    ] ++ stdenv.lib.optional valaSupport vala;
    buildInputs = with gnome3; [
      glib libsoup libxml2 gtk gnome-online-accounts
      gcr p11-kit libgweather libgdata libaccounts-glib json-glib
  
negative.code: 
    propagatedBuildInputs = [ libsecret nss nspr libical db ];
  
    cmakeFlags = [
      "-DENABLE_UOA=OFF"
      "-DENABLE_VALA_BINDINGS=ON"
      "-DENABLE_INTROSPECTION=ON"
      "-DCMAKE_SKIP_BUILD_RPATH=OFF"
      "-DINCLUDE_INSTALL_DIR=${placeholder "dev"}/include"
    ];
  
  
    preFixup = ''
      for f in $(find $out/libexec/ -type f -executable); do
  