gnu_getopt should be exported in __all__
diff --git a/Lib/getopt.py b/Lib/getopt.py
index fb98e88..c726217 100644
--- a/Lib/getopt.py
+++ b/Lib/getopt.py
@@ -31,7 +31,7 @@
 # - a option string with a W followed by semicolon should
 #   treat "-W foo" as "--foo"
 
-__all__ = ["GetoptError","error","getopt"]
+__all__ = ["GetoptError","error","getopt","gnu_getopt"]
 
 import os