gtk_builder_connect_signals(builder, w);
g_signal_connect(w->interp, "started", G_CALLBACK(on_interp_started), w);
g_signal_connect(w->interp, "stopped", G_CALLBACK(on_interp_stopped), w);
gtk_builder_connect_signals(builder, w);
g_signal_connect(w->interp, "started", G_CALLBACK(on_interp_started), w);
g_signal_connect(w->interp, "stopped", G_CALLBACK(on_interp_stopped), w);