extern "C" {
static gboolean
-gtk_window_leave_callback( GtkWidget *widget, GdkEventCrossing *gdk_event, wxMiniFrame *win )
+gtk_window_leave_callback(GtkWidget *widget,
+ GdkEventCrossing * WXUNUSED(gdk_event),
+ wxMiniFrame *win)
{
if (!win->m_hasVMT) return FALSE;
if (g_blockEventsOnDrag) return FALSE;