an overzealous DNS service (e.g. OpenDNS) redirects to a placeholder
Web site.

DNS service (e.g. OpenDNS) resolves a non-existent domain name.  The test
is now skipped instead.

The Python signal handler for SIGABRT is not called on os.abort() (only if the
signal is raised manually or sent by another process). Patch by Kamil Kisiel.

Python 3.1. callable() is again supported in Python 3.2.

OS X window manager connection in tk tests, use OS X Application Services
API calls instead.

subprocess.Popen.communicate() now also handles EINTR errors if the process has
only one pipe.

os.write() clamp the length to INT_MAX on Windows.

On FreeBSD, the SIGALRM signal is sometimes received by the reader thread.

test_tk or test_ttk_guionly under a username that is not currently logged
in to the console windowserver (as may be the case under buildbot or ssh).

shutdown, if globals()['__file__'] is None.

wasn't enabled at first.

the garbage collector while the Heap lock is held.

with known OS bugs

Share the list of platforms with known OS bugs with other tests. Patch written
by Charles-François Natali.

set the MACOSX_DEPLOYMENT_TARGET env variable for the interpreter process
on OS X.  This could cause failures in non-distutils subprocesses and was
unreliable since tests or user programs could modify the interpreter
environment after distutils set it.  Instead, have distutils set the
the deployment target only in the environment of each build subprocess.

Continue to use the previous algorithm for deriving the deployment target
value:
    if MACOSX_DEPLOYMENT_TARGET is not set in the interpreter's env:
        use the interpreter build configure MACOSX_DEPLOYMENT_TARGET
    elif the MACOSX_DEPLOYMENT_TARGET env value >= configure value:
        use the env MACOSX_DEPLOYMENT_TARGET
    else: # env value less than interpreter build configure value
        raise exception
This allows building extensions that can only run on newer versions of
the OS than the version python was built for, for example with a python
built for 10.3 or later and an extension that needs to be built for 10.5.

test_build_ext.

test_build_ext of test_distutils is no longer silently skipped when
run outside of a build directory.

os.lchflags() are once again built on systems that support these
functions (*BSD and OS X).  Also add new stat file flags for OS X
(UF_HIDDEN and UF_COMPRESSED).  Also add additional tests for
os.chflags() and os.lchflags(). (Tests by Garrett Cooper)

on Mac OS X.  (Patch by Ronald Oussoren)

A patch from Vincent Legoll.