I downloaded qt-unified-linux-x64-2.0.5-2-online.run and tried to use it on Linux/Wayland system to install Qt 5.9 Beta 1. This results in:
qt-unified-linux-x64-2.0.5-2-online.run(3698)/(default) unknown: This application failed to start because it could not find or load the Qt platform plugin "wayland"
Available platform plugins are: minimal, xcb.
Reinstalling the application may fix this problem.
Aborted (core dumped)