Concatenate JS files using ANT (keeping a specific order)

<filelist id="filelist" dir="path/to/base/directory">
   <file name="util.js"/>
   <file name="commons.js" />
</filelist>

<target name="concat-all">
    <concat destfile="whatever" encoding="UTF-8" outputencoding="UTF-8" fixlastline="true">
        <filelist refid="filelist" />
    </concat>
</target>

We use this approach, and later resulting file is compressed via yui-compressor.