cannot open include file qsqldatabase

[Saurian]

Hello. I've tried to right an app with Qt 5.1.1 using sql. When I build my app I get the following error: "Cannot open include file: 'QSqlDatabase': No such file or directory". I've already put the line in the .pro file: QT += sql

Has anyone any ideas what can I do? Thanks in advance.

P.S.: The part of my application with sql code is quite simple:

QSqlDatabase db(QSqlDatabase::addDatabase("QMYSQL"));
 
    //connect to database
    db.setDatabaseName("sarbatori.mwb");
 
    if ( !db.open() )
        QMessageBox::critical(0, "Error", db.lastError().text());
    else
        QMessageBox::information(0, "OK", "Merge!!!");

QSqlDatabase db(QSqlDatabase::addDatabase("QMYSQL"));

    //connect to database
    db.setDatabaseName("sarbatori.mwb");

    if ( !db.open() )
        QMessageBox::critical(0, "Error", db.lastError().text());
    else
        QMessageBox::information(0, "OK", "Merge!!!");

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