Fix external scrypt algo missing.
diff --git a/driver-cpu.h b/driver-cpu.h
index 3cf268b..e4b4452 100644
--- a/driver-cpu.h
+++ b/driver-cpu.h
@@ -60,5 +60,6 @@ extern void show_algo(char buf[OPT_SHOW_LEN], const enum sha256_algos *algo);
extern char *force_nthreads_int(const char *arg, int *i);
extern void init_max_name_len();
extern double bench_algo_stage3(enum sha256_algos algo);
+extern void set_scrypt_algo(enum sha256_algos *algo);
#endif /* __DEVICE_CPU_H__ */