src/example/multi-project/build.xml

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<project name="all" xmlns:ivy="antlib:org.apache.ivy.ant">

    <property name="ivy.jar.dir" value="${user.home}/.ivy2/jars"/>
    <property name="ivy.jar.file" value="${ivy.jar.dir}/ivy.jar"/>

    <property name="build.dir" value="build"/>
    <property name="src.dir" value="src"/>


    <!-- =================================
         target: load-ivy
         this target is not necessary if you put ivy.jar in your ant lib directory
         if you already have ivy 1.4 in your ant lib, you can simply remove this
         target
         ================================= -->
    <target name="load-ivy">
        <!-- try to load ivy here from home ivy dir, in case the user has not already dropped
             it into ant's lib dir (note that the latter copy will always take precedence).
             We will not fail as long as ivy home lib dir exists (it may be empty) and
             ivy is in at least one of ant's lib dir or the ivy home lib dir. -->
        <path id="ivy.lib.path">
            <pathelement location="${ivy.jar.file}"/>
        </path>
        <taskdef resource="org/apache/ivy/ant/antlib.xml"
                 uri="antlib:org.apache.ivy.ant" classpathref="ivy.lib.path"/>
    </target>

    <target name="buildlist" depends="load-ivy">
        <ivy:buildlist reference="build-path">
            <fileset dir="projects" includes="**/build.xml"/>
        </ivy:buildlist>
    </target>

    <target name="publish-all" depends="buildlist"
            description="compile, jar and publish all projects in the right order">
        <subant target="publish" buildpathref="build-path"/>
    </target>

    <target name="clean-all" depends="buildlist" description="clean all projects">
        <subant target="clean" buildpathref="build-path"/>
    </target>

    <target name="clean" depends="clean-all, load-ivy"
            description="clean tutorial: delete repository, ivy cache, and all projects">
        <delete dir="repository"/>
        <ivy:cleancache/>
  </target>
</project>