Object&nbsp;c)</pre>
<div class="block">Only fail if the given expression evaluates to false or tno
 property of the given name exists.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>c</code> - property name or evaluated expression</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>Ant 1.8.0</dd>
</dl>
</li>
</ul>
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<h4>setUnless</h4>
<pre>public&nbsp;void&nbsp;setUnless(ja