cc -pipe -O   -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_mutexattr_setrobust.c -o pthread/pthread_mutexattr_setrobust -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread -lrt  -lrt -lcrypt
pthread/pthread_mutexattr_setrobust.c: In function 'main':
pthread/pthread_mutexattr_setrobust.c:12:16: error: implicit declaration of function 'pthread_mutexattr_setrobust'; did you mean 'pthread_mutexattr_setprotocol'? [-Werror=implicit-function-declaration]
  if ( (errno = pthread_mutexattr_setrobust(&attr, PTHREAD_MUTEX_ROBUST)) )
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
                pthread_mutexattr_setprotocol
pthread/pthread_mutexattr_setrobust.c:12:51: error: 'PTHREAD_MUTEX_ROBUST' undeclared (first use in this function); did you mean 'PTHREAD_MUTEX_NORMAL'?
  if ( (errno = pthread_mutexattr_setrobust(&attr, PTHREAD_MUTEX_ROBUST)) )
                                                   ^~~~~~~~~~~~~~~~~~~~
                                                   PTHREAD_MUTEX_NORMAL
pthread/pthread_mutexattr_setrobust.c:12:51: note: each undeclared identifier is reported only once for each function it appears in
pthread/pthread_mutexattr_setrobust.c:15:16: error: implicit declaration of function 'pthread_mutexattr_getrobust'; did you mean 'pthread_mutexattr_getprotocol'? [-Werror=implicit-function-declaration]
  if ( (errno = pthread_mutexattr_getrobust(&attr, &robustness)) )
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
                pthread_mutexattr_getprotocol
cc1: some warnings being treated as errors