QSslSocket::sslLibraryVersionNumber() does not work

#include <QtCore>
#include <QtNetwork>

int main(int argc, char **argv) {

    QCoreApplication app(argc, argv);
    qDebug() << QSslSocket::sslLibraryVersionString() << "(" << QSslSocket::sslLibraryVersionNumber() << ")";
    return 0;
}

QSslSocket: cannot call unresolved function SSLeay
"OpenSSL 1.0.1 14 Mar 2012" ( 0 )