I have some issue with Gradle using Ant

For reference

Short story, I get problem trying to build a project using a build.xml ant script.

It complains about a missing ANTLR but it appears I do have that…

So my next guess is… does Gradle uses its own ant lib? If yes, how can I check it if ANTLR is really missing? Or how can I make it use the system one (that available on PATH)?