Raghu,
java5.check:

BUILD FAILED
/home/raghu/src-hadoop/trunk/build.xml:890: 'java5.home' is not defined.  Forrest 
requires Java 5.  Please pass -Djava5.home=<base of Java 5 distribution> to Ant 
on the command-line.

Currently, Hadoop requires java 5 for compiling documentation. The documentation program is Apache Forrest: http://forrest.apache.org/. And you also should have java 5, whose home should be given to ant.

So, you should run something like:

ant -Djava5.home=/path/to/java-5 -Dforrest.home=/path/to/forrest tar

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