cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration sched/sched_getparam.c -o sched/sched_getparam -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
sched/sched_getparam.c:12:7: error: call to undeclared function 'sched_getparam'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   12 |         if ( sched_getparam(0, &params) < 0 )
      |              ^
1 error generated.