This is needed for perl-Authen-DecHpwd and perl-Authen-Passphrase. The current master branch builds cleanly with no additional dependencies required in EPEL-8.
FEDORA-EPEL-2019-0724eec001 has been submitted as an update to Fedora EPEL 8. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2019-0724eec001
perl-Scalar-String-0.003-8.el8 has been pushed to the Fedora EPEL 8 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2019-0724eec001