Please install PepperFlash into one of these locations: http://code.qt.io/cgit/qt/qtwebengine.git/tree/src/core/content_client_qt.cpp#n170 and Widevine (which I think should really be a separate SRPM) into one of these locations: http://code.qt.io/cgit/qt/qtwebengine.git/tree/src/core/content_client_qt.cpp#n229 Otherwise, QtWebEngine will not find it. Unfortunately, the PepperFlash paths hardcode /usr/lib and /usr/lib64 and do not contain one path that is the same except for the libsuffix. (I think the assumption there is that people will only use the 64-bit version. The /usr/lib paths are intended for non-multilib distros.) So you would have to use completely different paths for the 32-bit and 64-bit plugin, or we will have to patch QtWebEngine. Your package is also missing: ExclusiveArch: %{ix86} x86_64