I am trying to wrap an Ant Prjoect in Maven using the maven-antrun-plugin.

This is my Plugin config

<plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.7</version>
            <executions>
                <execution>
                    <id>ant-tasks</id>
                    <phase>compile</phase>
                    <goals>
                    <goal>run</goal>
                    </goals>
                    <configuration>
            <target> 
            <ant antfile="build.xml"
            </ant>
            </target>
            <ivy:settings file="../.ivy2/ivysettings.xml" />
            <ivy:retrieve pattern="./[conf]/[artifact].[ext]" />
            <exportAntProperties>true</exportAntProperties>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>ant</groupId>
                    <artifactId>ant-nodeps</artifactId>
                    <version>1.6.5</version>
                </dependency>
                <dependency>
                    <groupId>ant</groupId>
                    <artifactId>ant-apache-regexp</artifactId>
                    <version>1.6.5</version>
                </dependency> 
                <dependency>
                    <artifactId>jakarta-regexp</artifactId>
                    <groupId>jakarta-regexp</groupId>
                    <version>1.4</version>
                </dependency>
                <dependency>
                    <groupId>com.sun</groupId>
                    <artifactId>tools</artifactId>
                    <version>1.5.0</version>
                    <scope>system</scope>
                    <systemPath>${java.home}/../lib/tools.jar</systemPath>
                </dependency>
                <dependency>
                    <groupId>org.apache.ivy</groupId>
                    <artifactId>ivy</artifactId>
                    <version>2.0.0</version>
                </dependency>
                <dependency>
                    <groupId>org.apache.ant</groupId>
                    <artifactId>ant</artifactId>
                    <version>1.7.0</version>
                </dependency>
                            </dependencies>
       </plugin>
  </plugins>

The maven build is failing with error

[javac] /__w/1/s/***/src/main/java/com/******/*****/***/****/******/******.java:29: package org.apache.tools.ant.util does not exist
[javac] import org.apache.tools.ant.util.FileUtils;

I have tried setting the %ANT_HOME% variable through plugin but it doesnt work. Tried different versions of ant dependency too, different error but same result.

How do I make maven locate the Ant libraries?

PS: The build is part of a Pipeline.