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On a fresh checkout, I'm getting two test failures:
$ ./configure && make
$ ./python.exe -m test.regrtest -v test_asyncore
 [snip]
======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv4Poll)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 674, in test_handle_expt
 self.loop_waiting_for_flag(client)
 File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 514, in loop_waiting_for_flag
 self.fail("flag not set")
AssertionError: flag not set
======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv6Poll)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 674, in test_handle_expt
 self.loop_waiting_for_flag(client)
 File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 514, in loop_waiting_for_flag
 self.fail("flag not set")
AssertionError: flag not set
----------------------------------------------------------------------
Ran 101 tests in 20.506s
FAILED (failures=2, skipped=6)
test test_asyncore failed
test_asyncore failed
1 test failed:
 test_asyncore
$ ./python.exe -m test.regrtest -v test_eintr
 [snip]
======================================================================
FAIL: test_poll (__main__.SelectEINTRTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 446, in test_poll
 self.assertGreaterEqual(dt, self.sleep_time)
AssertionError: 9.176997991744429e-06 not greater than or equal to 0.2
----------------------------------------------------------------------
Ran 22 tests in 5.288s
FAILED (failures=1, skipped=5)
---
stderr:
---
Traceback (most recent call last):
 File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 492, in <module>
 test_main()
 File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 488, in test_main
 SelectEINTRTest)
 File "/Users/raymond/cleancpython/Lib/test/support/__init__.py", line 1849, in run_unittest
 _run_suite(suite)
 File "/Users/raymond/cleancpython/Lib/test/support/__init__.py", line 1824, in _run_suite
 raise TestFailed(err)
test.support.TestFailed: Traceback (most recent call last):
 File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 446, in test_poll
 self.assertGreaterEqual(dt, self.sleep_time)
AssertionError: 9.176997991744429e-06 not greater than or equal to 0.2
---
----------------------------------------------------------------------
Ran 1 test in 5.424s
FAILED (failures=1)
test test_eintr failed
test_eintr failed
1 test failed:
 test_eintr
Total duration: 5 sec
Tests result: FAILURE

See https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/
C function poll() seems to be broken on Sierra.

Try to modify pyconfig.h to define HAVE_BROKEN_POLL. It should work around the bug.
configure.ac contains a test for HAVE_BROKEN_POLL. We need another test for poll() being broken differently.
Note: asyncio doesn't seem to be affect because it probably uses the more efficient kqueue by default on OS X.

This is a duplicate of Issue28087.