--- panel/panel.c.dist	2017-12-04 22:45:45.000000000 +0900
+++ panel/panel.c	2017-12-04 22:45:48.000000000 +0900
@@ -533,6 +533,7 @@
     gtk_window_move(GTK_WINDOW(p->topgwin), p->ax, p->ay);
     gtk_window_resize(GTK_WINDOW(p->topgwin), p->aw, p->ah);
     DBG("move-resize x %d y %d w %d h %d\n", p->ax, p->ay, p->aw, p->ah);
+    gtk_window_set_geometry_hints(GTK_WINDOW(p->topgwin), p->topgwin, NULL, GDK_HINT_POS | GDK_HINT_USER_POS); /* needed for twm */
     //XSync(GDK_DISPLAY(), False);
     //gdk_flush();