Qt SDK ship broken xcb qpa on linux

I setup some Qt SDK pre compiled Qt versions on a headless remote server (from 5.4 to 5.8).
When I run my GUI tests (using xvfb) on my CI, Qt 5.6 and 5.7 crash with the following message:

This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

The error also appear when trying to starts qdbusviewer from a forwarded x11 server (ssh -X).

After investigations using ldd tool it appear that those versions have their xcb qpa plugin linking libEGL.so.1, missing on my headless system.
All other versions, including Qt 5.8 do not link libEGL.so.1.

libEGL.so.1 => not found