Exclude jar from ant classpath

I am trying to setup "pure maven" in some legacy project that uses ant scripts. I don't know much about ant, so my question might seem naive.

I'm almost ready, but the ant script delivery fails due to redundancy in the classpath. If I understand assembly, these lines should add to the classpath every lib in the "provided" scope:

<artifact:dependencies pathid="dependency.classpath" scopes="provided">
    <pom file="./pom.xml"/>
</artifact:dependencies>

      

        
        
        
      

    

And then this one:

<path id="completecp">
    <fileset dir="${ant.home}/lib">
        <include name="*.jar" />
    </fileset>
    <path refid="dependency.classpath" />
</path>

      

        
        
        
      

    

Add these dependencies to the libs in the ant.home directory.

The problem is that I am using a maven pom that depends on the parent pom, which I cannot change, and as a result, there are three different ant versions in my classpath: two from the POM (1.5 et 1.7.1) and one from Eclipse (1.8.2). I tried (desperately!) Adding some kind of maven exception, but failed unsuccessfully.

So I thought, maybe there is a way to exclude jars from the ant classpath. I've tried putting:

<exclude name="*ant\1.7.1\ant-1.7.1.jar"/>
<exclude name="*ant\1.5\ant-1.5.jar"/>

      

        
        
        
      

    

in the fileset part, but it doesn't work. Is there a way to eliminate this excess jar?