cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_time/FD_ISSET.c -o sys_time/FD_ISSET -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
sys_time/FD_ISSET.c:9:2: error: #error "FD_ISSET is not defined"
    9 | #error "FD_ISSET is not defined"
      |  ^~~~~