cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_attr_getschedparam.c -o pthread/pthread_attr_getschedparam -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
pthread/pthread_attr_getschedparam.c: In function ‘main’:
pthread/pthread_attr_getschedparam.c:13:23: error: implicit declaration of function ‘pthread_attr_getschedparam’ [-Wimplicit-function-declaration]
   13 |         if ( (errno = pthread_attr_getschedparam(&attr, &param)) )
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~