Hi,
You would need maven (I am using 3.0.3) to build it initially. There are quite a few dependencies which I don't know how to set up using just ant. I just pushed a fix to git to set up the jboss repositories in the pom.xml, so I think it should work now with a new maven setup. Just check it out from git and then from the project root directory:
/path/to/maven/installation/bin/mvn install
Since the tests use JMS make sure you build it against a server started using (since the default profile does not have JMS):
standalone.sh --server-config=test
Or to not bother with tests
/path/to/maven/installation/bin/mvn install -Dmaven.test.skip=true
Once you have the project built, you can probably just include target/jboss-as-remote-via-jmx-7.0.0-SNAPSHOT.jar (or the compiled classes are also available in target/classes) and do a bit of work in ant to rename it to whatever.sar and add the META-INF/jboss-service.xml file and a META-INF/MANIFEST.MF containing:
Manifest-Version: 1.0
Dependencies: javax.jms.api,org.hornetq,javax.api
HTH