gtk3: enable tracker

pkgs/development/libraries/gtk/3.x.nix

@@ -30,6 +30,8 @@
 , gnome3
 , gsettings-desktop-schemas
 , sassc
+, trackerSupport ? stdenv.isLinux
+, tracker
 , x11Support ? stdenv.isLinux
 , waylandSupport ? stdenv.isLinux
 , mesa
@@ -91,6 +93,7 @@ stdenv.mkDerivation rec {
   mesonFlags = [
     "-Dgtk_doc=${boolToString withGtkDoc}"
     "-Dtests=false"
+    "-Dtracker3=${boolToString trackerSupport}"
   ];
 
   # These are the defines that'd you'd get with --enable-debug=minimum (default).
@@ -137,6 +140,7 @@ stdenv.mkDerivation rec {
     isocodes
   ]
   ++ optional stdenv.isDarwin AppKit
+  ++ optional trackerSupport tracker
   ;
 
   propagatedBuildInputs = with xorg; [