diff --git a/configure.ac b/configure.ac
index 757922e..ed2ba00 100755
--- a/configure.ac
+++ b/configure.ac
@@ -629,6 +629,7 @@
   tutorial/py/Makefile
   tutorial/py.twisted/Makefile
   tutorial/py.tornado/Makefile
+  tutorial/rb/Makefile
 ])
 
 AC_OUTPUT