Implemented PEP 405 (Python virtual environments).
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index cdcd389..44b9554 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -2543,7 +2543,7 @@
 
 def test_coverage(coverdir):
     trace = support.import_module('trace')
-    tracer = trace.Trace(ignoredirs=[sys.prefix, sys.exec_prefix,],
+    tracer = trace.Trace(ignoredirs=[sys.base_prefix, sys.base_exec_prefix,],
                          trace=0, count=1)
     tracer.run('test_main()')
     r = tracer.results()