-AC_ARG_WITH([backup-prefix],
- [ --with-backup-prefix=, set the backup prefix [,]])
-if test x"$with_backup_prefix" != x -a x"$with_backup_prefix" != x"no"; then
- backup_prefix="$with_backup_prefix"
+AC_ARG_WITH([hash-backup],
+ [ --with-hash-backup use # as the backup prefix (default: ,)])
+if test x"$with_hash_backup" != x -a x"$with_hash_backup" != x"no"; then
+ backup_prefix="#"