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STUNExternalIP.c: In function 'getPublicIPAddress':
STUNExternalIP.c:195:12: error: variable 'tv' has initializer but incomplete type
struct timeval tv = {5, 0};
^~~~~~~
STUNExternalIP.c:195:26: warning: excess elements in struct initializer
struct timeval tv = {5, 0};
^
STUNExternalIP.c:195:26: note: (near initialization for 'tv')
STUNExternalIP.c:195:29: warning: excess elements in struct initializer
struct timeval tv = {5, 0};
^
STUNExternalIP.c:195:29: note: (near initialization for 'tv')
STUNExternalIP.c:195:20: error: storage size of 'tv' isn't known
struct timeval tv = {5, 0};
^~
STUNExternalIP.c:197:62: error: invalid application of 'sizeof' to incomplete type 'struct timeval'
setsockopt(socketd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval));
^~~~~~
make: *** [: STUNExternalIP.o] Error 1
Compiling the code in alpine linux produces the above error. Including sys/time.h solves it.