See this page:
note the following error:
[exec] svn: This client is too old to work with working copy
'src/test/core/org/apache/hadoop/http/lib'. You need
[exec] to get a newer Subversion client, or to downgrade this working copy.
[exec] See http://subversion.tigris.org/faq.html#working-copy-format-change
[exec] for details.
Aaron T. Myers
Software Engineer, Cloudera