I keep getting this undefined reference:

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error: undefined reference to `KWallet::Wallet::openWallet(QString const&, unsigned long long, KWallet::Wallet::OpenType)'

Source code :

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WId wid = 0;
    Wallet* wallet = Wallet::openWallet(Wallet::NetworkWallet(),wid,Wallet::Synchronous);

.pro file:

...

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LIBS += #-lgnome-keyring \
            -lglib-2.0 \
            -lkdecore \
            -lkdeui \
            -lkparts
   
    INCLUDEPATH += /usr/include/gnome-keyring-1 \
                   /usr/include/glib-2.0  \
                   /usr/lib/x86_64-linux-gnu/glib-2.0/include \
                   /usr/include/KDE

...

I think I have linked all required libs, don't know where the mistake could be. I use qmake and QtCreator IDE.

It gives undefined reference only for

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Wallet::openWallet()

Nothing for

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Wallet::NetworkWallet(), Wallet::hasFolder(),Wallet::createFolder()

... I don't know why it can't find reference only for one function.

Well I found the problem. The problem is somehow in QT-Creator, when I built it myself, through Makefile, it worked.