test_distutils fails like this:

test test_distutils crashed -- <type 'exceptions.TypeError'>: object of type 'NoneType' has no len()
Traceback (most recent call last):
  File "Lib\test\regrtest.py", line 560, in runtest_inner
    indirect_test()
  File "c:\Python26\lib\test\test_distutils.py", line 13, in test_main
    test.test_support.run_unittest(distutils.tests.test_suite())
  File "c:\Python26\lib\distutils\tests\__init__.py", line 30, in test_suite
    suite.addTest(module.test_suite())
  File "c:\Python26\lib\distutils\tests\test_build_ext.py", line 391, in test_suite
    src = _get_source_filename()
  File "c:\Python26\lib\distutils\tests\test_build_ext.py", line 22, in _get_sou
rce_filename
    return os.path.join(srcdir, 'Modules', 'xxmodule.c')
  File "c:\Python26\lib\ntpath.py", line 96, in join
    assert len(path) > 0
TypeError: object of type 'NoneType' has no len()

Not sure whether this is a regression from 2.6.4.