<taskdef name="deploypurge" classname="com.salesforce.ant.SFDCDeployPurge" classpath="../lib/ant-salesforce.jar"/>
<deploypurge purgeOnDelete="true" username="${sf.username}" password="${sf.password}" serverurl="${sf.server}" deployRoot="stage/deploy" singlePackage="true" runAllTests="false" rollbackOnError="false" allowMissingFiles="true" maxPoll="2000" pollWaitMillis="5000"/>

<sf:deploy purgeOnDelete="true" username="${sf.username}" password="${sf.password}" serverurl="${sf.serverurl}" maxPoll="${sf.maxPoll}" deployRoot="mypkg" rollbackOnError="true"/>