コンパイル中以下のようなエラーになります。

/usr/lib/qt3/include/qlayout.h:379:
note: candidates are: virtual void QBoxLayout::addItem(QLayoutItem*)
/usr/lib/qt3/include/private/qucom_p.h: At global scope:
/usr/lib/qt3/include/private/qucom_p.h:69: warning:
'struct QUBuffer' has virtual functions but non-virtual destructor
/usr/lib/qt3/include/private/qucom_p.h:77: warning:
'struct QUType' has virtual functions but non-virtual destructor
・・・・・
make[4]: *** [threadviewbase.lo] エラー 1

何が原因でしょうか？　OpenSUSEです。