bxgaillard commented on this pull request.
gtk_widget_set_size_request(target_button_browse, BROWSE_BUTTON_WIDTH, 0);
g_signal_connect(G_OBJECT(target_button_browse), "clicked", G_CALLBACK (on_target_browse_clicked), NULL);
/* debugger */ debugger_label = gtk_label_new(_("Debugger:")); +#if GTK_CHECK_VERSION(3, 0, 0) + debugger_cmb = gtk_combo_box_text_new();
I agree. Fixed.