cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sched/sched_getscheduler.c -o sched/sched_getscheduler -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
sched/sched_getscheduler.c:6:1: error: parameter names (without types) in function declaration [-Wdeclaration-missing-parameter-type]
    6 | int (*foo)(pid_t) = sched_getscheduler;
      | ^~~
sched/sched_getscheduler.c:6:21: error: ‘sched_getscheduler’ undeclared here (not in a function)
    6 | int (*foo)(pid_t) = sched_getscheduler;
      |                     ^~~~~~~~~~~~~~~~~~