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    Undefined reference error - how to add #include to .pro file ?

    Unsolved C++ Gurus what
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    andrA
    Looks like the headers are fine, but you don't seem to link the library where the things from this header is implemented, i.e. something like LIBS += -L$SOME_PATH -lBT_Config_Library Seen https://doc.qt.io/qt-6/qmake-variable-reference.html#libs