cc -O2 -pipe  -pthread  -Wall -Wextra -Werror=implicit-function-declaration sched/sched_setparam.c -o sched/sched_setparam -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread 
sched/sched_setparam.c:11:7: error: call to undeclared function 'sched_getparam'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        if ( sched_getparam(0, &params) < 0 )
             ^
sched/sched_setparam.c:17:7: error: call to undeclared function 'sched_setparam'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        if ( sched_setparam(0, &params) < 0 )
             ^
2 errors generated.