build-common-ant-common.xml

<project name="build-common" xmlns:ivy="antlib:org.apache.ivy.ant">
	<dirname property="build-common-ant-common.basedir" file="${ant.file.build-common}" />
	<import file="${build-common-ant-common.basedir}/build-common-ant-ivy.xml" />
	<target name="init" />
        <target name="service-version" depends="build-number"/>
</project>

build-common-ant-ivy.xml

<?xml version="1.0"?>
<project name="ivy-common" basedir="." xmlns:ivy="antlib:org.apache.ivy.ant">

	<target name="load-ivy-tasks" unless="complete.ivy-common.load-ivy-tasks">
	</target>

	<target name="init" depends="load-ivy-tasks" unless="${ivy.offline}">
	</target>

	<target name="build-number" description="publish module with ivy" depends="resolve,init" unless="${ivy.offline}">
	</target>

	<target name="resolve" depends="init" unless="${ivy.offline}">
	</target>
	<target name="report" depends="resolve,init" unless="${ivy.offline}">
	</target>
<!-- COMMENT FROM HERE TO ...
-->
	<target name="deliver" depends="resolve,build-number,init" unless="${ivy.offline}">
	</target>

	<target name="-determine-release" depends="init">
	</target>

	<target name="-publish" description="publish module with ivy" depends="resolve,build-number,init" unless="${ivy.offline}">
	</target>
	
	<target name="-determine-tagging" depends="-determine-release">
	</target>
	
	<target name="publish" description="publish module with ivy and tag git" depends="-publish,-determine-tagging" if="${vineyard.tag-git}">
	</target>
<!-- ... HERE TO MAKE THE BUILD WORK
-->
</project>

build.gradle

ant.importBuild 'build.xml'
task hello{
	println tasks['build-number'].path
}

build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="example" basedir="." default="export" xmlns:ivy="antlib:org.apache.ivy.ant">
	<import file="build-common-ant-common.xml" />
</project>