P2: Important Description
When building Qt, all generated libraries have RUNPATH=$ORIGIN.
Except libQt5Pdf.so and libQt5WebEngineCore.so. Their RUNPATH also contain an entry pointing to Qt install path.
Example on 5.15.2 libraries provided by the open source online installer:
chrpath -l libQt5WebEngine*.so libQt5WebEngine.so: RUNPATH=$ORIGIN libQt5WebEngineCore.so: RUNPATH=/home/qt/work/install/lib:$ORIGIN libQt5WebEngineWidgets.so: RUNPATH=$ORIGIN
Example on 5.15.4 libraries built from source:
chrpath -l *.so.5.15.4 libQt5Pdf.so.5.15.4: RUNPATH=/opt/Qt/5.15.2/gcc_64/lib:$ORIGIN libQt5PdfWidgets.so.5.15.4: RUNPATH=$ORIGIN libQt5WebEngine.so.5.15.4: RUNPATH=$ORIGIN libQt5WebEngineCore.so.5.15.4: RUNPATH=/opt/Qt/5.15.2/gcc_64/lib:$ORIGIN libQt5WebEngineWidgets.so.5.15.4: RUNPATH=$ORIGIN