Downgrade to 5.0.2 and ship only the Qt 5 style for F20/F21.
    
    Oxygen 5.0.x matches the look&feel of the KDE 4 theme. Oxygen 5.1.0 got
    major changes which make the look&feel closer to Breeze, and can be
    built against KDE 4 to obtain the same look&feel there. We want to keep
    the original KDE 4 Oxygen look&feel on Fedora <= 21.