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Because we don't have any OS/2 and VMS maintainer for Python 3, I propose to drop OS/2 and VMS support in Python 3.3: OSes unsupported in 3.3, code removed in 3.4 (see the PEP 11 for the process).

@loewis: Would you like to review the patch?
You wrote on python-dev:
"For OS/2, I propose to syntactically break the makefile"
and
"For VMS, I *think* the build process is configure-based (but I may
misremember); if so, adding an exit into configure.in would be
appropriate."
But I don't know how to do that.
I added two #error for each OS, I hope that it is enough. But I am unable to test my patch, I don't have access to these OSes :-)

Oh, I just realized that the PEP 11 doesn't ask to mention unsupported OSes in the What's new document. New patch to mention that OS/2 and VMS are no more supported.

The patch looks fine; please add a reference to PEP 11 into the error messages, though (so that people can find out that they can volunteer to maintain it).

I wrote to the maintainer of vmspython, and he said this:
"Python on VMS is actively maintained, for example you can take a look at
http://www.vmspython.org/ and http://www.vmspython.org/History
Our plan are to port, this year 2.7, then 3.x."
So the vmspython project looks active, but that still does not help
us of course. I hope Jean-François will comment here.

How can we help you ?

Would be possible to publish a notice in "python insider" blog?.Enigmail

> How can we help you ?
Please contribute a full, complete, working VMS port to Python 3.3.
I never understood whether the code that we have is supposed to be
complete, in the sense that you get a working Python out of it
(rather, I understood that this never was the case - that you always
needed additional pieces to make it do something useful).
Another step to demonstrate ongoing support would be to contribute
a VMS build slave, so that committers without VMS (which is nearly
100%) can actually find out whether it continues to work after
changes.
I'd also like to see a dedicated maintainer nominated - a person who'll
respond to bug reports about the VMS support; if that person ever
leaves, and no new maintainer is nominated, the code would again be
up for removal.
If no demonstrable improvement is contributed to Python 3.3, I'd
continue with the PEP 11 process.

New changeset ec754f8d2917 by Victor Stinner in branch 'default':
Issue #11918: OS/2 and VMS are no more supported because of the lack of
http://hg.python.org/cpython/rev/ec754f8d2917 

> The patch looks fine; please add a reference to PEP 11 
> into the error messages
Ok, done.
> "Our plan are to port, this year 2.7, then 3.x."
VMS is unsupported in 3.3 and the code will be removed in 3.4. If anyone comes with patches to have a working VMS version before Python 3.4, we can support VMS again and just forget the PEP 11 deprecation.
> Would be possible to publish a notice in "python insider" blog?
Sure, but I don't want to write it. Contact Doug Hellmann for that. Marc Andre Lemburg is also volunteer to write such notice.

What we have planed is to release 2.7 in september, and I think we will be on time, so we can start working on 3.x in october, is it compatible with your schedule?

PEP 398 -- Python 3.3 Release Schedule
http://www.python.org/dev/peps/pep-0398/