[lwip-users] error compiling linux port

[Sam]

Hello 
I'm new in lwIP stack and I'm trying to use the linux's port in the
contrib's files. 
When I'm trying to compile, I face this error : 


 ../../../../lwip/src/core/dns.c:101:23: error: implicit declaration of
function ‘LWIP_RAND’ [-Werror=implicit-function-declaration]
 #define DNS_RAND_TXID LWIP_RAND
                       ^
../../../../lwip/src/core/dns.c:858:25: note: in expansion of macro
‘DNS_RAND_TXID’
     u16_t port = (u16_t)DNS_RAND_TXID();
                         ^
../../../../lwip/src/core/dns.c:858:5: error: nested extern declaration of
‘LWIP_RAND’ [-Werror=nested-externs]
     u16_t port = (u16_t)DNS_RAND_TXID();


thanks for any help :) 




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