Merged release21-maint changes.
diff --git a/Mac/Distributions/src.exclude b/Mac/Distributions/src.exclude
index e87fbf7..4d9e3fb 100644
--- a/Mac/Distributions/src.exclude
+++ b/Mac/Distributions/src.exclude
@@ -18,3 +18,4 @@
 Makefile.pre.in
 PyIDE-src
 [(]*[)]
+*~[0-9]