Change argument list for addsitedir() to not require a second argument and thus
match old verion's argument list (overlooked since API of the file is
undocumented).
diff --git a/Lib/site.py b/Lib/site.py
index a5fce06..241068c 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -145,7 +145,7 @@
known_paths = None
return known_paths
-def addsitedir(sitedir, known_paths):
+def addsitedir(sitedir, known_paths=None):
"""Add 'sitedir' argument to sys.path if missing and handle .pth files in
'sitedir'"""
if known_paths is None: