Running test_errno on my 32-bit Ubuntu Gutsy machine gives me this:

$ ./python Lib/test/test_errno.py
test_for_improper_attributes (__main__.ErrnoAttributeTests) ... FAIL
test_using_errorcode (__main__.ErrnoAttributeTests) ... ok
test_attributes_in_errorcode (__main__.ErrorcodeTests) ... ok

======================================================================
FAIL: test_for_improper_attributes (__main__.ErrnoAttributeTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Lib/test/test_errno.py", line 46, in test_for_improper_attributes
    "%s is an unexpected error value" % attribute)
AssertionError: EREMOTEIO is an unexpected error value

----------------------------------------------------------------------
Ran 3 tests in 0.001s

FAILED (failures=1)
Traceback (most recent call last):
  File "Lib/test/test_errno.py", line 68, in <module>
    test_main()
  File "Lib/test/test_errno.py", line 64, in test_main
    test_support.run_unittest(ErrnoAttributeTests, ErrorcodeTests)
  File "/home/andy/cvs/python/Lib/test/test_support.py", line 573, in
run_unittest
    _run_suite(suite)
  File "/home/andy/cvs/python/Lib/test/test_support.py", line 556, in
_run_suite
    raise TestFailed(err)
test.test_support.TestFailed: Traceback (most recent call last):
  File "Lib/test/test_errno.py", line 46, in test_for_improper_attributes
    "%s is an unexpected error value" % attribute)
AssertionError: EREMOTEIO is an unexpected error value

I've attached a patch which changes test_errno.py so that its list of
expected errors exactly matches the possible errors listed in
Modules/errnomodule.c in the latest SVN trunk.

I don't know whether this is the right solution, but the patch is there
if it is :)

Apologies if I've misunderstood something, or formatted the patch wrong
etc.  This is my first Python patch.