I have came up with this solution:
<ac:for param="file">
<path>
<fileset dir="${mymodule}">
<!-- <include name="**/*.jar"/> -->
</fileset>
</path>
<sequential>
<local name="filename" />
<basename property="filename" file="@{file}"/>
<echo message="${filename}"/>
<cvs cvsrsh="plink" cvsroot="${cvsroot}" dest="${mymodule}" command="add -kb ${filename}"/>
</sequential>
</ac:for>
I finally surrender to ant-contrib. If anyone make a different approach, let me know.