Okay, thanks for your response. On 2015/7/30 16:49, Richard W.M. Jones wrote: > On Thu, Jul 30, 2015 at 04:47:57PM +0800, Yu Liu wrote: >> Well, is it possible to enable it with 1.20 on OEL6.6? > No, the feature wasn't implemented until 1.22. > > Rich. > -- Thanks! Luis Liu