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When I run the Qt5 application in the Yocto 2.6.4, it has the "version Qt_5 not defined in file libQt5Gui.so.5 with link time reference" error.
I used the meta-qt5 -b thud version.
What version of Qt 5 is being used for your run time libraries? What version of Qt 5 is the minimum required for the application? The complaint is about QGradient::~QGradient() which switched from inlined to normal around Qt 5.14
QGradient::~QGradient()