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I completed the cross compilation, and example can finsh compile, however,when it deploy ,qt creator receive " /usr/lib/libQt5Mqtt.so.5: symbol _ZTI10QSslSocket version Qt_5 not defined in file libQt5Network.so.5 with link time reference "
Okay, I solved this problem. After I finished cross-compiling, there was a lib file that was not copied to the development board file directory