cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_attr_setschedpolicy.c -o pthread/pthread_attr_setschedpolicy -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lnetwork -lbsd -latomic
pthread/pthread_attr_setschedpolicy.c: In function 'main':
pthread/pthread_attr_setschedpolicy.c:18:23: error: implicit declaration of function 'pthread_attr_setschedpolicy'; did you mean 'pthread_attr_setschedparam'? [-Werror=implicit-function-declaration]
   18 |         if ( (errno = pthread_attr_setschedpolicy(&attr, policy)) )
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       pthread_attr_setschedparam
cc1: some warnings being treated as errors