QWidget::setBackgroundColor() is gone.

...and we have to tell Qt to paint the background.

t14/gamebrd.cpp

@@ -36,7 +36,9 @@ GameBoard::GameBoard(QWidget *parent)
     frame->setFrameStyle( QFrame::WinPanel | QFrame::Sunken );
 
     cannonField = new CannonField( this );
-    cannonField->setBackgroundColor( QColor( 250, 250, 200) );
+
+    cannonField->setPalette( QPalette(QColor(250, 250, 200)) );
+    cannonField->setAutoFillBackground(true);
 
     connect( angle,SIGNAL(valueChanged(int)), cannonField,SLOT(setAngle(int)));
     connect( cannonField,SIGNAL(angleChanged(int)), angle,SLOT(setValue(int)));