hydraConfig["binary_cache_public_key_file"],

            hydraConfig["binary_cache_public_key_file"],

    const Path & secretKeyFile, const Path & publicKeyFile,
    const std::string & bucketName)
    : BinaryCacheStore(localStore, secretKeyFile, publicKeyFile)

    const Path & secretKeyFile, const std::string & bucketName)
    : BinaryCacheStore(localStore, secretKeyFile)

        const Path & secretKeyFile, const Path & publicKeyFile,
        const std::string & bucketName);

        const Path & secretKeyFile, const std::string & bucketName);