https://bugzilla.redhat.com/show_bug.cgi?id=1331825
--- Comment #2 from Dominik 'Rathann' Mierzejewski dominik@greysector.net --- IPv6 support by default is required by the packaging guidelines: https://fedoraproject.org/wiki/Packaging:Guidelines#Networking_Support
There is nothing in EPEL-specific guidelines to the contrary, so the above applies for EPEL as well. Please add the missing Requires.