("-backend",Arg.Set_string(Globals.backend), "Backend directory");
("-frontend",Arg.Tuple[Arg.String(fun s->cur_dir:=s);Arg.String(fun s->cur_slice:=s;input_file_list:=(!cur_dir,!cur_slice)::!input_file_list)], "frontendN,slicenameN");
("-nochroot",Arg.Set(Globals.nochroot), "Run in non-chroot environment")
("-backend",Arg.Set_string(Globals.backend), "Backend directory");
("-frontend",Arg.Tuple[Arg.String(fun s->cur_dir:=s);Arg.String(fun s->cur_slice:=s;input_file_list:=(!cur_dir,!cur_slice)::!input_file_list)], "frontendN,slicenameN");
("-nochroot",Arg.Set(Globals.nochroot), "Run in non-chroot environment")