I have many error relate btstack submodule

[daihhqn87]

Hello everyone,

I'm a new developer. I checkout this open source and run in Linux enviroment.
I got some errors to relate btstack submodule when run make command in discovery folder as:
btstack/src/classic/avrcp_browsing.h:58:6: warning: redundant redeclaration of ‘avrcp_browsing_register_controller_packet_handler’ [-Wredundant-decls]
void avrcp_browsing_register_controller_packet_handler(btstack_packet_handler_t callback);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack_memory.h:69:0,
from ../btstack/src/btstack.h:64,
from discovery.c:15:
../btstack/src/classic/avrcp.h:684:6: note: previous declaration of ‘avrcp_browsing_register_controller_packet_handler’ was here
void avrcp_browsing_register_controller_packet_handler(btstack_packet_handler_t callback);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack.h:109:0,
from discovery.c:15:
../btstack/src/classic/avrcp_browsing.h:59:6: warning: redundant redeclaration of ‘avrcp_browsing_register_target_packet_handler’ [-Wredundant-decls]
void avrcp_browsing_register_target_packet_handler(btstack_packet_handler_t callback);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack_memory.h:69:0,
from ../btstack/src/btstack.h:64,
from discovery.c:15:
../btstack/src/classic/avrcp.h:685:6: note: previous declaration of ‘avrcp_browsing_register_target_packet_handler’ was here
void avrcp_browsing_register_target_packet_handler(btstack_packet_handler_t callback);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack.h:109:0,
from discovery.c:15:
../btstack/src/classic/avrcp_browsing.h:60:6: warning: redundant redeclaration of ‘avrcp_browsing_request_can_send_now’ [-Wredundant-decls]
void avrcp_browsing_request_can_send_now(avrcp_browsing_connection_t * connection, uint16_t l2cap_cid);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack_memory.h:69:0,
from ../btstack/src/btstack.h:64,
from discovery.c:15:
../btstack/src/classic/avrcp.h:686:6: note: previous declaration of ‘avrcp_browsing_request_can_send_now’ was here
void avrcp_browsing_request_can_send_now(avrcp_browsing_connection_t * connection, uint16_t l2cap_cid);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack.h:109:0,
from discovery.c:15:
../btstack/src/classic/avrcp_browsing.h:66:6: warning: redundant redeclaration of ‘avrcp_browsing_init’ [-Wredundant-decls]
void avrcp_browsing_init(void);
^~~~~~~~~~~~~~~~~~~
In file included from ../btstack/src/btstack_memory.h:69:0,
from ../btstack/src/btstack.h:64,
from discovery.c:15:
../btstack/src/classic/avrcp.h:639:6: note: previous declaration of ‘avrcp_browsing_init’ was here
void avrcp_browsing_init(void);

Note that: I already install lsusb package and I check out btstack and run some Example success on my system.
Could you please help me on it?
Many Thanks!