It is not optimal to test sys.stderr on a debug build.
diff --git a/Lib/test/test_sysconfig.py b/Lib/test/test_sysconfig.py
index 606ccd0..59cba97 100644
--- a/Lib/test/test_sysconfig.py
+++ b/Lib/test/test_sysconfig.py
@@ -245,8 +245,7 @@
         def get(python):
             cmd = [python, '-c',
                    'import sysconfig; print sysconfig.get_platform()']
-            p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
-                                      stderr=subprocess.PIPE)
+            p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
             return p.communicate()
         real = os.path.realpath(sys.executable)
         link = os.path.abspath(TESTFN)