cc -O2 -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations netdb/IPPORT_RESERVED.c -o netdb/IPPORT_RESERVED -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lintl -lcrypt
netdb/IPPORT_RESERVED.c:2:17: error: 'IPPORT_RESERVED' undeclared here (not in a function)
    2 | int const foo = IPPORT_RESERVED;
      |                 ^~~~~~~~~~~~~~~