cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sched/sched_rr_get_interval.c -o sched/sched_rr_get_interval -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
sched/sched_rr_get_interval.c:6:40: error: 'sched_rr_get_interval' undeclared here (not in a function)
    6 | int (*foo)(pid_t, struct timespec *) = sched_rr_get_interval;
      |                                        ^~~~~~~~~~~~~~~~~~~~~