showed that maven-ant-tasks.jar was on the classpath, and unpacking the jar showed that it contained the required antlib.xml that ant -v was looking for:
[antlib:org.apache.maven.artifact.ant] Could not load definitions from resource org/apache/maven/artifact/ant/antlib.xml. It could not be found.
Weird. I don't think I had this issue last time around.
This has been reported by another user of Fedora but I was unable to recreate myself. Could you confirm the jar isn't corrupted in any way by running: