Error detailed below.. I reverted the changes to sysconfig.py from rev
59488 and the error goes away.  I believe the suspect line is:

# head
python_build = os.path.isfile(os.path.join(project_base, "Modules",
                                           "Setup.local"))
# after revert
python_build = os.path.isfile(os.path.join(project_base, "Modules",
                                           "Setup.dist"))



D:\work\py trunk\PCbuild9>rt test_distutils
Deleting .pyc/.pyo files ...
92 .pyc deleted, 0 .pyo deleted

D:\work\py trunk\PCbuild9>python  -E -tt ../lib/test/regrtest.py
test_distutils
test_distutils
test test_distutils failed -- Traceback (most recent call last):
  File "D:\work\py trunk\lib\distutils\tests\test_sysconfig.py", line
16, in test_get_config_h_filename
    self.assert_(os.path.isfile(config_h), config_h)
AssertionError: D:\work\py trunk\include\pyconfig.h

1 test failed:
    test_distutils
About to run again without deleting .pyc/.pyo first:
Press any key to continue . . .

Fixed in r59511
The Makefile VPATH fix broke an unit test on Windows. The code now
checks if any of the files exist.