cross-compilation support for python build

Lib/test/test_tools.py

 """Tests for scripts in the Tools directory.
 
 This file contains regression tests for some of the scripts found in the
 Tools directory of a Python checkout or tarball, such as reindent.py.
 """
 
 import os
 import sys
 import importlib.machinery
 import unittest
 from unittest import mock
 import sysconfig
 import tempfile
 from test import support
 from test.script_helper import assert_python_ok
 
 if not sysconfig.is_python_build():
     # XXX some installers do contain the tools, should we detect that
     # and run the tests in that case too?
     raise unittest.SkipTest('test irrelevant for an installed Python')
 
-srcdir = sysconfig.get_config_var('projectbase')
+srcdir = sysconfig.get_config_var('srcdir')
 basepath = os.path.join(os.getcwd(), srcdir, 'Tools')
 scriptsdir = os.path.join(basepath, 'scripts')
 
 
 class ReindentTests(unittest.TestCase):
     script = os.path.join(scriptsdir, 'reindent.py')
 
     def test_noargs(self):
         assert_python_ok(self.script)
 
@@ skipping 96 matching lines @@
     from test_unparse import UnparseTestCase
 
 
 def test_main():
     support.run_unittest(*[obj for obj in globals().values()
                                if isinstance(obj, type)])
 
 
 if __name__ == '__main__':
     unittest.main()