diff --git a/buildout/mysql-tritonn-5.0/buildout.cfg b/buildout/mysql-tritonn-5.0/buildout.cfg
index ff9bb5aec0302058280537bc219d39c9db3790cf..e50c2ecf2def0ab620234723ccfa54d61d4265f7 100644
--- a/buildout/mysql-tritonn-5.0/buildout.cfg
+++ b/buildout/mysql-tritonn-5.0/buildout.cfg
@@ -36,3 +36,7 @@ patches =
     ${buildout:directory}/mysql-tritonn-5.0/patches/tritonn-1.0.12-mysql-5.0.87.diff
 environment =
     PATH =${senna:location}/bin:%(PATH)s
+
+[requirements]
+binary = flex bison
+development =