int cnt, i, doubledash;
        const char *errstr = NULL;
 
-       argc = parse_options(argc, argv, check_attr_options, check_attr_usage,
-               PARSE_OPT_KEEP_DASHDASH);
+       argc = parse_options(argc, argv, prefix, check_attr_options,
+                            check_attr_usage, PARSE_OPT_KEEP_DASHDASH);
        if (!argc)
                usage_with_options(check_attr_usage, check_attr_options);
 
        else if (stdin_paths && doubledash < argc)
                errstr = "Can't specify files with --stdin";
        if (errstr) {
-               error (errstr);
+               error("%s", errstr);
                usage_with_options(check_attr_usage, check_attr_options);
        }