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  -liconv
sched/sched_getscheduler.c:6:12: error: a parameter list without types is only allowed in a function definition
    6 | int (*foo)(pid_t) = sched_getscheduler;
      |            ^
sched/sched_getscheduler.c:6:21: error: use of undeclared identifier 'sched_getscheduler'
    6 | int (*foo)(pid_t) = sched_getscheduler;
      |                     ^
2 errors generated.