compiler error with PLUGIN_PERFSCHEMA=NO: ‘key_file_cnf’ defined but not used [-Werror=unused-variable]

/home/ycp/source/mariadb-server/11.8/src/extra/mariadb_migrate_config_file.c:138:21: error: ‘key_file_cnf’ defined but not used [-Werror=unused-variable]

  138 | static PSI_file_key key_file_cnf;

      |                     ^~~~~~~~~~~~

cc1: all warnings being treated as errors

make[2]: *** [extra/CMakeFiles/mariadb-migrate-config-file.dir/build.make:132: extra/CMakeFiles/mariadb-migrate-config-file.dir/mariadb_migrate_config_file.c.o] Error 1

make[1]: *** [CMakeFiles/Makefile2:10387: extra/CMakeFiles/mariadb-migrate-config-file.dir/all] Error 2

make[1]: *** Waiting for unfinished jobs....