anchor.diff:  
     propagatedBuildInputs = [ libsecret nss nspr libical db ];
   
  -  # uoa irrelevant for now
     cmakeFlags = [
       "-DENABLE_UOA=OFF"
  -  ] ++ stdenv.lib.optionals valaSupport [
       "-DENABLE_VALA_BINDINGS=ON"
       "-DENABLE_INTROSPECTION=ON"
       "-DCMAKE_SKIP_BUILD_RPATH=OFF"
  +    "-DINCLUDE_INSTALL_DIR=${placeholder "dev"}/include"
     ];
   
  -  enableParallelBuilding = true;
   
     preFixup = ''
       for f in $(find $out/libexec/ -type f -executable); do
  
positive.code:     done
    '';
  
    meta = with stdenv.lib; {
      license = licenses.lgpl2;
      maintainers = gnome3.maintainers;
      platforms = platforms.linux;
  
negative.code: { fetchurl, stdenv, pkgconfig, gnome3, python3, dconf, gobjectIntrospection
  , intltool, libsoup, libxml2, libsecret, icu, sqlite
  , p11-kit, db, nspr, nss, libical, gperf, makeWrapper
  , vala, cmake, ninja, kerberos, openldap, webkitgtk, libaccounts-glib, json-glib }:
  
  stdenv.mkDerivation rec {
    name = "evolution-data-server-${version}";
    version = "3.28.0";
  
    outputs = [ "out" "dev" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/evolution-data-server/${gnome3.versionBranch version}/${name}.tar.xz";
      sha256 = "1ybyyy6nls11az8lbri1y9527snz5h7qbhyfqvk0vc6vzvald5gv";
    };
  
    nativeBuildInputs = [
      cmake ninja pkgconfig intltool python3 gperf makeWrapper gobjectIntrospection vala
    ];
    buildInputs = with gnome3; [
      glib libsoup libxml2 gtk gnome-online-accounts
      gcr p11-kit libgweather libgdata libaccounts-glib json-glib
  