Hello, Could you please create epel8 branch and build proxysql there? Feel free to add me as co-maintainer, so I can help you with maintenance and essentially can do this work for you. Thanks!
FEDORA-EPEL-2020-0014d6314a has been submitted as an update to Fedora EPEL 8. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2020-0014d6314a
FEDORA-EPEL-2020-0014d6314a has been pushed to the Fedora EPEL 8 stable repository. If problem still persists, please make note of it in this bug report.