for ( size_t n = 0; n < pageCount; n++ )
     {
         GtkRequisition req;
-        gtk_widget_size_request(GetNotebookPage(n)->m_box, &req);
+        gtk_widget_get_preferred_size(GetNotebookPage(n)->m_box, NULL, &req);
         sizeTabMax.IncTo(wxSize(req.width, req.height));
     }
 
     // first page.
     pageData->m_imageIndex = imageId;
 
-    pageData->m_box = gtk_hbox_new(false, 1);
+    pageData->m_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 1);
     gtk_container_set_border_width(GTK_CONTAINER(pageData->m_box), 2);
 
     pageData->m_image = NULL;
     const size_t count = GetPageCount();
     size_t i = 0;
 
-#if !GTK_CHECK_VERSION(3,0,0) && !defined(GSEAL_ENABLE)
+#ifndef __WXGTK3__
     GtkNotebook * notebook = GTK_NOTEBOOK(m_widget);
     if (gtk_notebook_get_scrollable(notebook))
         i = g_list_position( notebook->children, notebook->first_tab );
 wxVisualAttributes
 wxNotebook::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 {
-    return GetDefaultAttributesFromGTKWidget(gtk_notebook_new);
+    return GetDefaultAttributesFromGTKWidget(gtk_notebook_new());
 }
 
 #endif