diff -r be4bec689de3 Lib/lib-tk/test/runtktests.py
--- a/Lib/lib-tk/test/runtktests.py	Tue Mar 19 17:17:47 2013 -0700
+++ b/Lib/lib-tk/test/runtktests.py	Wed Mar 20 12:49:51 2013 -0700
@@ -7,6 +7,7 @@
 """
 
 import os
+import subprocess
 import sys
 import unittest
 import importlib
@@ -23,28 +24,8 @@
     if _tk_unavailable is None:
         _tk_unavailable = False
         if sys.platform == 'darwin':
-            # The Aqua Tk implementations on OS X can abort the process if
-            # being called in an environment where a window server connection
-            # cannot be made, for instance when invoked by a buildbot or ssh
-            # process not running under the same user id as the current console
-            # user.  To avoid that, raise an exception if the window manager
-            # connection is not available.
-            from ctypes import cdll, c_int, pointer, Structure
-            from ctypes.util import find_library
-
-            app_services = cdll.LoadLibrary(find_library("ApplicationServices"))
-
-            if app_services.CGMainDisplayID() == 0:
-                _tk_unavailable = "cannot run without OS X window manager"
-            else:
-                class ProcessSerialNumber(Structure):
-                    _fields_ = [("highLongOfPSN", c_int),
-                                ("lowLongOfPSN", c_int)]
-                psn = ProcessSerialNumber()
-                psn_p = pointer(psn)
-                if (  (app_services.GetCurrentProcess(psn_p) < 0) or
-                      (app_services.SetFrontProcess(psn_p) < 0) ):
-                    _tk_unavailable = "cannot run without OS X gui process"
+            if subprocess.check_output(["launchctl", "managername"]).rstrip() != "Aqua":
+                _tk_unavailable = "not running under Aqua"
         else:   # not OS X
             import Tkinter
             try: