memory leak в qt примерах

Qt 4.5.1, при запуске любого примера, valgrind выявляет утечку памяти в чем может быть причина?например для valgrind ./simpletextviewer генерится такой лог:Код:==19694== ERROR SUMMARY: 13 errors from 4 contexts (suppressed: 418 from 3)==19694== malloc/free: in use at exit: 142,822 bytes in 3,235 blocks.==19694== malloc/free: 32,873 allocs, 29,638 frees, 5,041,373 bytes allocated.==19694== For counts of detected errors, rerun with: -v==19694== Use --track-origins=yes to see where uninitialised values come from==19694== searching for pointers to 3,235 not-freed blocks.==19694== checked 522,224 bytes.==19694== ==19694== LEAK SUMMARY:==19694== definitely lost: 292 bytes in 11 blocks.==19694== possibly lost: 0 bytes in 0 blocks.==19694== still reachable: 142,530 bytes in 3,224 blocks.==19694== suppressed: 0 bytes in 0 blocks.