How do you verify your Ant version?

In my last post, I mentioned that "SecureInputHandler" was only added as of Ant 1.7.1.

But how do you make your buildfile require a particular version of Ant??

You can do it this way. It works, but its inelegant.

You can also do it this way:

<property name="ant.min-version" value="1.7.1" /> 
 <target name="verify-ant">
  <fail message="Ant version is '${ant.version}'.  Must have ant version ${ant.min-version}+">
   <condition>
    <not><antversion atleast="${ant.min-version}" /></not>
   </condition>
  </fail>
 </target>