How to call Ant from another build.xml with params?

Hello!

I need to be able to call several ant files with specified targets and in same  call I also need to pass soam params like "-Dtest=f"

My environment looks like:
C:\folderA
In folder A I got a build.xml taht initiate the calls :
 
<target name="clean_build_deploy">
    <ant antfile="C:/folderB/build.xml" target="clean" />
    <exec executable="ant">
      <arg value="f=C:/folderB/build.xml"/>
     
<arg value="build"/>
<arg value="-Dtest=f"/>
    </exec>
<ant antfile="C:/folderB/build.xml" target="deploy" />
  </target>

C:\folderB 
In folderB ther is another build.xml that I can no edit for some reasons.

It looks like my exec-part is not correct. But with exec is the only idea I got to be able to pass params like "-Dtest=f"

So if you got any ideas please let me know!
Best regards
Fredrik