 tar.</p>

<p>If the loss of path or file
information is not acceptable, and it rarely is, longfile may be set to the
value <code>gnu</code> or <code>posix</code>.  With <code>posix</code>
  Ant will add PAX extension headers, with <code>gnu</code> it adds
  GNU tar specific extensions that newer versions of GNU tar call
  "oldgnu".  GNU tar still creates these extensions by default but
  supports PAX extension headers as well.  Either choice will produce
  a tar file which
can have arbitrary length paths. 