Bird 1.6.4 was already released in March 2018 and should make it to the current stable Fedora branches at least. See also: http://trubka.network.cz/pipermail/bird-users/2018-March/012084.html
*** This bug has been marked as a duplicate of bug 1524385 ***
Build available: https://koji.fedoraproject.org/koji/taskinfo?taskID=30832857
bird-1.6.4-2.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-8f0d2429d3
bird-1.6.4-2.fc29 has been submitted as an update to Fedora 29. https://bodhi.fedoraproject.org/updates/FEDORA-2018-6aada550ca
bird-1.6.4-2.fc28 has been pushed to the Fedora 28 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-2018-8f0d2429d3
bird-1.6.4-2.fc29 has been pushed to the Fedora 29 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-2018-6aada550ca
bird-1.6.4-2.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-c25e48ded1
bird-1.6.4-2.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-2018-c25e48ded1
bird-1.6.4-2.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.
bird-1.6.4-2.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
bird-1.6.4-2.fc29 has been pushed to the Fedora 29 stable repository. If problems still persist, please make note of it in this bug report.