@zeroDawn
That may actually be an OK combination then. You might Google for qt 5.11 qtwebkit.
Your errors actually seem to come from the /usr/lib/libQt5Sensors.so.5.11.1 when linking, rather than from the QtWebKit stuff?
The other Qt libraries being linked with are in /usr/lib64/ but libQt5Sensors.so.5.11.1 is in /usr/lib, I don't know whether that indicates a 32-/64-bit or other non-compatible mismatch?
Do you know when it last compiled/linked successfully on such a system?
I think I'll leave it at that, others may know better than I. I think it is possible your actual issue is with libQt5Sensors rather than the QtWebKit stuff.