Use connect() to a Qt terminal application?

[hakermania]

#include <stdlib.h>
#include <QtCore/QTimer>
 
void check(){
//perform a check every 10 secs
}
 
int main()
{
    QTimer *timer = new QTimer;
    connect(timer, SIGNAL(timeout()), this, SLOT(check()));
    timer->start(10000)
    return 0;
}

#include <stdlib.h>
#include <QtCore/QTimer>

void check(){
//perform a check every 10 secs
}

int main()
{
    QTimer *timer = new QTimer;
    connect(timer, SIGNAL(timeout()), this, SLOT(check()));
    timer->start(10000)
    return 0;
}

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Ok, this is the code.... i get error that connect() wasn't declared over here :/
What Qt library should I include to use connect() function? Thank you!