void e_outname_f(Fl_Widget *, void *)
{
  Fl_File_Chooser *choose = new Fl_File_Chooser(".", "*", Fl_File_Chooser::DIRECTORY, "Select output directory");
  choose->preview(0);
  choose->show();
  choose->callback(e_outname_f_ret);
}
void d_filename_f(Fl_Widget *, void *)
{
  Fl_File_Chooser *choose = new Fl_File_Chooser(".", "GPack files (*.grp)", Fl_File_Chooser::SINGLE, "Select an existing merge");
  choose->preview(0);
  choose->show();
  choose->callback(d_filename_f_ret);
}