cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/F_DUPFD_CLOFORK.c -o fcntl/F_DUPFD_CLOFORK -D_POSIX_C_SOURCE=202405L  -lm -lpthread   -liconv
fcntl/F_DUPFD_CLOFORK.c:3:2: error: "F_DUPFD_CLOFORK is not defined"
    3 | #error "F_DUPFD_CLOFORK is not defined"
      |  ^
1 error generated.