config_exclusive_filename = getenv(CONFIG_ENVIRONMENT);
 
-       argc = parse_options(argc, argv, builtin_config_options, builtin_config_usage,
+       argc = parse_options(argc, argv, prefix, builtin_config_options,
+                            builtin_config_usage,
                             PARSE_OPT_STOP_AT_NON_OPTION);
 
        if (use_global_config + use_system_config + !!given_config_file > 1) {
                check_argc(argc, 0, 0);
                if (git_config(show_all_config, NULL) < 0) {
                        if (config_exclusive_filename)
-                               die("unable to read config file %s: %s",
-                                   config_exclusive_filename, strerror(errno));
+                               die_errno("unable to read config file '%s'",
+                                         config_exclusive_filename);
                        else
                                die("error processing config file(s)");
                }