diff --git a/ext/digest/bubblebabble/.cvsignore b/ext/digest/bubblebabble/.cvsignore
new file mode 100644
index 0000000000..814345ece8
--- /dev/null
+++ b/ext/digest/bubblebabble/.cvsignore
@@ -0,0 +1,4 @@
+Makefile
+mkmf.log
+*.def
+extconf.h