Please branch and build antlr3 in epel9. If you do not wish to maintain antlr3 in epel9, or do not think you will be able to do this in a timely manner, I would be happy to be a co-maintainer of the package (FAS kathenas); please add me through https://src.fedoraproject.org/rpms/antlr3/adduser
I have added you as co-maintainer, Phil. Please go ahead and take care of the epel9 build.