The locale failures on the DragonFly buildbot are caused by an OS bug:

bugs.dragonflybsd.org/issues/2415


I'm opening an issue so that this is recorded and other people hopefully
won't waste time debugging the failures. I intend to close the issue
as invalid in a couple of days.

======================================================================
FAIL: test_wide_char_separator_decimal_point (test.test_decimal.CFormatTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cpython/buildslave/3.x.snakebite-dragonfly30-amd64-1/build/Lib/test/test_decimal.py", line 1149, in test_wide_char_separator_decimal_point
    '100\u066c000\u066c000\u066b123')
AssertionError: '100000000.123' != '100\u066c000\u066c000\u066b123'
- 100000000.123
?          ^
+ 100\u066c000\u066c000\u066b123
?    +   +   ^


======================================================================
ERROR: test_basic (test.test_strptime.getlang_Tests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cpython/buildslave/3.x.snakebite-dragonfly30-amd64-1/build/Lib/test/test_strptime.py", line 16, in test_basic
    self.assertEqual(_strptime._getlang(), locale.getlocale(locale.LC_TIME))
  File "/home/cpython/buildslave/3.x.snakebite-dragonfly30-amd64-1/build/Lib/_strptime.py", line 31, in _getlang
    return locale.getlocale(locale.LC_TIME)
  File "/home/cpython/buildslave/3.x.snakebite-dragonfly30-amd64-1/build/Lib/locale.py", line 524, in getlocale
    return _parse_localename(localename)
  File "/home/cpython/buildslave/3.x.snakebite-dragonfly30-amd64-1/build/Lib/locale.py", line 433, in _parse_localename
    raise ValueError('unknown locale: %s' % localename)
ValueError: unknown locale: ps_AF