The version of mingw-w64-tools currently in epel7 FTBFS on aarch64. This can be fixed with a merge from at least f6a48a6, build, and update.
mingw-w64-tools-3.1.999-0.4.trunk.git430863.20140530.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-6d4993a2d2
mingw-w64-tools-3.1.999-0.4.trunk.git430863.20140530.el7 has been pushed to the Fedora EPEL 7 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-2016-6d4993a2d2
mingw-w64-tools-3.1.999-0.4.trunk.git430863.20140530.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.