cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations netdb/AI_V4MAPPED.c -o netdb/AI_V4MAPPED -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
netdb/AI_V4MAPPED.c:2:17: error: use of undeclared identifier 'AI_V4MAPPED'
int const foo = AI_V4MAPPED;
                ^
1 error generated.