SF patch 1631942 by Collin Winter:
(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block
diff --git a/Mac/scripts/buildpkg.py b/Mac/scripts/buildpkg.py
index e6dc474..e50c405 100644
--- a/Mac/scripts/buildpkg.py
+++ b/Mac/scripts/buildpkg.py
@@ -451,7 +451,7 @@
 
     try:
         opts, args = getopt.getopt(sys.argv[1:], shortOpts, longOpts)
-    except getopt.GetoptError, details:
+    except getopt.GetoptError as details:
         print details
         printUsage()
         return