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