Where is r.water.outlet?

Dear All:

Does anybody know where the actual r.water.outlet program is?
Its name appears in the manual of the standard GRASS 4.1 release.

Thanks.

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Jianping Xu
Center for Remote Sensing and Spatial Analysis Email: jianp@ocean.rutgers.edu
Rutgers University Phone: (908) 932-9631
New Brunswick, NJ 08903-0231 Fax: (908) 932-8746