Github user praste commented on the issue:
https://github.com/apache/zookeeper/pull/148
Are sure you removed reference to `slf4j-log4j12` from all the `ivy.xml`
files?
I am not an ivy expert but you can take a look at
http://stackoverflow.com/questions/5405310/find-hidden-dependencies-in-ivy
and
http://ant.apache.org/ivy/history/latest-milestone/use/dependencytree.html
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