I'm not seeing Japanese text properly displayed when I compile this simple code. What am I forgetting?

Qt Code:
  1. #include <QtGui/QApplication>
  2. #include <QMessageBox>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6. QApplication a(argc, argv);
  7. QMessageBox::critical(0, "わたし", "私", QMessageBox::Cancel);
  8. }
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