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A few errnos from OSX are missing in the eponymous module.
--- 8< ---
#ifdef EAUTH
 inscode(d, ds, de, "EAUTH", EAUTH, "Authentication error");
#endif
#ifdef EBADARCH
 inscode(d, ds, de, "EBADARCH", EBADARCH, "Bad CPU type in executable");
#endif
#ifdef EBADEXEC
 inscode(d, ds, de, "EBADEXEC", EBADEXEC, "Bad executable (or shared library)");
#endif
#ifdef EBADMACHO
 inscode(d, ds, de, "EBADMACHO", EBADMACHO, "Malformed Mach-o file");
#endif
#ifdef EBADRPC
 inscode(d, ds, de, "EBADRPC", EBADRPC, "RPC struct is bad");
#endif
#ifdef ECANCELED
 inscode(d, ds, de, "ECANCELED", ECANCELED, "Operation canceled");
#endif
#ifdef EDEVERR
 inscode(d, ds, de, "EDEVERR", EDEVERR, "Device error");
#endif
#ifdef EFTYPE
 inscode(d, ds, de, "EFTYPE", EFTYPE, "Inappropriate file type or format");
#endif
#ifdef ENEEDAUTH
 inscode(d, ds, de, "ENEEDAUTH", ENEEDAUTH, "Need authenticator");
#endif
#ifdef ENOATTR
 inscode(d, ds, de, "ENOATTR", ENOATTR, "Attribute not found");
#endif
#ifdef ENOPOLICY
 inscode(d, ds, de, "ENOPOLICY", ENOPOLICY, "Policy not found");
#endif
#ifdef ENOTSUP
 inscode(d, ds, de, "ENOTSUP", ENOTSUP, "Operation not supported");
#endif
#ifdef EPROCLIM
 inscode(d, ds, de, "EPROCLIM", EPROCLIM, "Too many processes");
#endif
#ifdef EPROCUNAVAIL
 inscode(d, ds, de, "EPROCUNAVAIL", EPROCUNAVAIL, "Bad procedure for program");
#endif
#ifdef EPROGMISMATCH
 inscode(d, ds, de, "EPROGMISMATCH", EPROGMISMATCH, "Program version wrong");
#endif
#ifdef EPROGUNAVAIL
 inscode(d, ds, de, "EPROGUNAVAIL", EPROGUNAVAIL, "RPC prog. not avail");
#endif
#ifdef EPWROFF
 inscode(d, ds, de, "EPWROFF", EPWROFF, "Device power is off");
#endif
#ifdef ERPCMISMATCH
 inscode(d, ds, de, "ERPCMISMATCH", ERPCMISMATCH, "RPC version wrong");
#endif
#ifdef ESHLIBVERS
 inscode(d, ds, de, "ESHLIBVERS", ESHLIBVERS, "Shared library version mismatch");
#endif
--- >8 ---
(PS: catched by scripting around https://github.com/pcarrier/stuff/blob/master/sys/errnos.c if someone wants to play with other "exotic" architectures)

This shell-fragment lists which names in /usr/include/sys/errno don't exist in errnomodule.h:
$ grep '#define[ ]*E' /usr/include/sys/errno.h | 
 awk '{ print 2ドル }' | grep -v '^ELAST$' | 
 while read name; do 
 grep -q $name Modules/errnomodule.c || echo $name; 
 done | sort
The following names in your list are already part in errnomodule.h:
* ECANCELED
* ENOTSUP
The patch looks fine otherwise. I'm currently rebuilding python3.3 and will commit the patch if everything works properly.

And the patch works properly, with the patch applied (except for the two names I mentioned earlier):
$ DYLD_FRAMEWORK_PATH=$PWD ./python.exe
Python 3.3a0 (default:5fa92a47016c+, May 7 2011, 09:36:44) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import errno
>>> errno.EAUTH
80
>>> errno.ECANCELED
89
>>> errno.ENOTSUP
45
>>> errno.EPROGMISMATCH
75
>>>

New changeset 2f978b4c02ad by Ronald Oussoren in branch 'default':
Closes Issue 11916: Add a number of MacOSX specific definitions to the errno module.
http://hg.python.org/cpython/rev/2f978b4c02ad