cc -pthread   -Wall -Wextra -Werror=implicit-function-declaration sched/sched_rr_get_interval.c -o sched/sched_rr_get_interval -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread  -lgdbm_compat -lintl -lnetwork -lbsd -latomic
sched/sched_rr_get_interval.c: In function 'main':
sched/sched_rr_get_interval.c:14:14: error: implicit declaration of function 'sched_rr_get_interval' [-Werror=implicit-function-declaration]
   14 |         if ( sched_rr_get_interval(0, &ts) < 0 )
      |              ^~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors