memory-leak in QApplication

the following code results in memory-leaks as reported by valgrind

#include <QtGui>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
return 0;
}

valgrind says:
==7104== LEAK SUMMARY:
==7104== definitely lost: 2,976 bytes in 11 blocks
==7104== indirectly lost: 9,380 bytes in 471 blocks
==7104== possibly lost: 368,091 bytes in 2,886 blocks
==7104== still reachable: 458,817 bytes in 7,197 blocks
==7104== suppressed: 0 bytes in 0 blocks
==7104== Reachable blocks (those to which a pointer was found) are not shown.
==7104== To see them, rerun with: --leak-check=full --show-reachable=yes