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