Those are the ones available:
I tried to build an ant plugin for maven as explained in http://maven.apache.org/guides/plugin/guide-ant-plugin-development.html to refactor out the ant fragment and all went smooth until I needed a reference to the maven classpath.
I just assumed I could use the classpath references in the maven-script-ant plugin.
I took me a while to realize that the 2.0.9 version of the maven-script-ant has no support for it and that support is currently available on trunk.
I had to download the source code and build 2.1-SNAPSHOT.jar by my self.