I would like to have 4.15 because I need the python binding which only builds against 4.15. Thanks.

Updating to 4.15 on f20,f21

libev-4.15-1.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/libev-4.15-1.fc20

Package libev-4.15-1.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing libev-4.15-1.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2013-16093/libev-4.15-1.fc20
then log in and leave karma (feedback).

This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle.
Changing version to '20'.

More information and reason for this action is here:
https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora20

libev-4.15-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.