diff --git a/include/ao/.cvsignore b/include/ao/.cvsignore
new file mode 100644
index 0000000000000000000000000000000000000000..9ca9303da9a9531ffc0227135bb3a58ee0ea44a0
--- /dev/null
+++ b/include/ao/.cvsignore
@@ -0,0 +1,3 @@
+os_types.h
+Makefile
+Makefile.in