Import the test properly.  This is especially important for py3k.
diff --git a/Lib/test/test_extcall.py b/Lib/test/test_extcall.py
index b6dc144..8088fe2 100644
--- a/Lib/test/test_extcall.py
+++ b/Lib/test/test_extcall.py
@@ -255,7 +255,7 @@
 from test import test_support
 
 def test_main():
-    import test_extcall # self import
+    from test import test_extcall # self import
     test_support.run_doctest(test_extcall, True)
 
 if __name__ == '__main__':