File db-4.8.30-cwd-db_config.patch of Package libdb4
--- db-5.3.28/src/env/env_open.c.old 2017-06-26 10:32:11.011419981 +0200 +++ db-5.3.28/src/env/env_open.c 2017-06-26 10:32:46.893721233 +0200 @@ -473,7 +473,7 @@ env->db_mode = mode == 0 ? DB_MODE_660 : mode; /* Read the DB_CONFIG file. */ - if ((ret = __env_read_db_config(env)) != 0) + if (env->db_home != NULL && (ret = __env_read_db_config(env)) != 0) return (ret); /*