diff -r 097b72d73594 Lib/shutil.py
--- a/Lib/shutil.py	Fri Apr 27 00:20:39 2012 -0700
+++ b/Lib/shutil.py	Fri Apr 27 19:18:42 2012 +0200
@@ -102,8 +102,10 @@
         try:
             os.chflags(dst, st.st_flags)
         except OSError, why:
-            if (not hasattr(errno, 'EOPNOTSUPP') or
-                why.errno != errno.EOPNOTSUPP):
+            for err in 'EOPNOTSUPP', 'ENOTSUP':
+                if hasattr(errno, err) and why.errno == getattr(errno, err):
+                    break
+            else:
                 raise
 
 def copy(src, dst):
diff -r 097b72d73594 Lib/test/test_shutil.py
--- a/Lib/test/test_shutil.py	Fri Apr 27 00:20:39 2012 -0700
+++ b/Lib/test/test_shutil.py	Fri Apr 27 19:18:42 2012 +0200
@@ -7,6 +7,7 @@
 import stat
 import os
 import os.path
+import errno
 from os.path import splitdrive
 from distutils.spawn import find_executable, spawn
 from shutil import (_make_tarball, _make_zipfile, make_archive,
@@ -339,6 +340,34 @@
                 shutil.rmtree(TESTFN, ignore_errors=True)
                 shutil.rmtree(TESTFN2, ignore_errors=True)
 
+    @unittest.skipUnless(hasattr(errno, 'EOPNOTSUPP') and
+                         hasattr(errno, 'ENOTSUP'),
+                         "requires EOPNOTSUPP & ENOTSUP")
+    def test_copystat_handles_harmless_chflags_errors(self):
+        tmpdir = self.mkdtemp()
+        file1 = os.path.join(tmpdir, 'file1')
+        file2 = os.path.join(tmpdir, 'file2')
+        self.write_file(file1, 'xxx')
+        self.write_file(file2, 'xxx')
+
+        def make_chflags_raiser(err):
+            ex = OSError()
+
+            def _chflags_raiser(path, flags):
+                ex.errno = err
+                raise ex
+            return _chflags_raiser
+        old_chflags = os.chflags
+        try:
+            for err in errno.EOPNOTSUPP, errno.ENOTSUP:
+                os.chflags = make_chflags_raiser(err)
+                shutil.copystat(file1, file2)
+            # assert others errors break it
+            os.chflags = make_chflags_raiser(errno.EOPNOTSUPP + errno.ENOTSUP)
+            self.assertRaises(OSError, shutil.copystat, file1, file2)
+        finally:
+            os.chflags = old_chflags
+
     @unittest.skipUnless(zlib, "requires zlib")
     def test_make_tarball(self):
         # creating something to tar
diff -r 097b72d73594 Misc/ACKS
--- a/Misc/ACKS	Fri Apr 27 00:20:39 2012 -0700
+++ b/Misc/ACKS	Fri Apr 27 19:18:42 2012 +0200
@@ -753,6 +753,7 @@
 Michael Scharf
 Neil Schemenauer
 David Scherer
+Hynek Schlawack
 Gregor Schmid
 Ralf Schmitt
 Michael Schneider
diff -r 097b72d73594 Modules/errnomodule.c
--- a/Modules/errnomodule.c	Fri Apr 27 00:20:39 2012 -0700
+++ b/Modules/errnomodule.c	Fri Apr 27 19:18:42 2012 +0200
@@ -783,6 +783,9 @@
 #ifdef WSAN
     inscode(d, ds, de, "WSAN", WSAN, "Error WSAN");
 #endif
+#ifdef ENOTSUP
+    inscode(d, ds, de, "ENOTSUP", ENOTSUP, "Operation not supported");
+#endif
 
     Py_DECREF(de);
 }