cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sched/SCHED_RR.c -o sched/SCHED_RR -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv
sched/SCHED_RR.c:3:17: error: ‘SCHED_RR’ undeclared here (not in a function)
    3 | int const foo = SCHED_RR;
      |                 ^~~~~~~~