Issue #12408: Fix relative import in test_future5.py.  Thanks Cesare Di Mauro.
diff --git a/Lib/test/test_future5.py b/Lib/test/test_future5.py
index 9ca3a36..ed03a07 100644
--- a/Lib/test/test_future5.py
+++ b/Lib/test/test_future5.py
@@ -3,7 +3,7 @@
 
 import sys
 import unittest
-from . import support
+from test import support
 
 
 class TestMultipleFeatures(unittest.TestCase):