$Summary says it all, currently gammayray is FTBFS against Qt-5.5 Filing this bug for tracking purposes
I'm working on 2.3.0 update which has Qt 5.5 support.
gammaray-2.3.0-1.fc22 has been submitted as an update for Fedora 22. https://admin.fedoraproject.org/updates/gammaray-2.3.0-1.fc22
gammaray-2.3.0-1.fc23 has been submitted as an update for Fedora 23. https://admin.fedoraproject.org/updates/gammaray-2.3.0-1.fc23
gammaray-2.3.0-1.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/gammaray-2.3.0-1.fc21
gammaray-2.3.0-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
gammaray-2.3.0-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
gammaray-2.3.0-1.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.