how to import the package org.apache.hadoop.mapreduce.lib.chain in a hadoop 0.20.2 project?

I'm trying to chain maps and reduces phases in one job. The problem is that I'm running under hadoop 0.20.2 and the package org.apache.hadoop.mapred.lib.Chain seems to be deprecated and replaced by the package org.apache.hadoop.mapredu开发者_如何转开发ce.lib.chain which is not available with the 0.20.2 version (only 0.21.0 version)

My question is: what should I do to import the org.apache.hadoop.mapreduce.lib.chain package to my project? Is there any patch or update to apply?