What support for STL sets?

[feraudyh]

Hello,
I need to store ordered sets of various types so I thought STL sets would be just the thing, so I wrote a test programme that began like this:

#include <QtCore/QCoreApplication>
#include <set>
#include <iterator>
#include <iostream>
using std::cout;
using std::endl;
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    set<int> intSet1;
// more follows

#include <QtCore/QCoreApplication>
#include <set>
#include <iterator>
#include <iostream>
using std::cout;
using std::endl;

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    set<int> intSet1;
// more follows

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Unfortunately the compiler tells me that "set was not declared in this scope".

Is STL not supported, or have I made a mistake?
I'm using QTCreator++ 1.3.0 with MinGW in Windows XP