cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/O_CLOFORK.c -o fcntl/O_CLOFORK -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lcrypt -latomic
fcntl/O_CLOFORK.c:3:2: error: #error "O_CLOFORK is not defined"
    3 | #error "O_CLOFORK is not defined"
      |  ^~~~~