Added to fix Qt build issue with pre Qt 5.12 builds.

src/boards/28.cpp

@@ -53,8 +53,8 @@ void Mirror(uint8 value)
 
 static void Sync()
 {		
-	int prglo;
-	int prghi;
+	int prglo = 0;
+	int prghi = 0;
 
 	int outb = outer << 1;
 	//this can probably be rolled up, but i have no motivation to do so

src/drivers/Qt/ConsoleWindow.cpp

@@ -444,7 +444,7 @@ void consoleWin_t::setViewerCursor( Qt::CursorShape s )
 
 Qt::CursorShape consoleWin_t::getViewerCursor(void)
 {
-	Qt::CursorShape s;
+	Qt::CursorShape s = Qt::ArrowCursor;
 
 	if ( viewport_GL )
 	{

src/drivers/Qt/GuiConf.cpp

@@ -727,9 +727,11 @@ static const char *getRoleText( QPalette::ColorRole role )
 		case QPalette::ToolTipText:
 			rTxt = "ToolTipText";
 		break;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
 		case QPalette::PlaceholderText:
 			rTxt = "PlaceholderText";
 		break;
+#endif
 		case QPalette::Text:
 			rTxt = "Text";
 		break;