cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_barrierattr_destroy.c -o pthread/pthread_barrierattr_destroy -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
pthread/pthread_barrierattr_destroy.c:9:2: error: unknown type name 'pthread_barrierattr_t'; did you mean 'pthread_mutexattr_t'?
    9 |         pthread_barrierattr_t attr;
      |         ^~~~~~~~~~~~~~~~~~~~~
      |         pthread_mutexattr_t
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/_pthread/_pthread_mutexattr_t.h:31:38: note: 'pthread_mutexattr_t' declared here
   31 | typedef __darwin_pthread_mutexattr_t pthread_mutexattr_t;
      |                                      ^
pthread/pthread_barrierattr_destroy.c:10:16: error: call to undeclared function 'pthread_barrierattr_init'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   10 |         if ( (errno = pthread_barrierattr_init(&attr)) )
      |                       ^
pthread/pthread_barrierattr_destroy.c:10:16: note: did you mean 'pthread_mutexattr_init'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/pthread.h:431:5: note: 'pthread_mutexattr_init' declared here
  431 | int pthread_mutexattr_init(pthread_mutexattr_t *);
      |     ^
pthread/pthread_barrierattr_destroy.c:12:16: error: call to undeclared function 'pthread_barrierattr_destroy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   12 |         if ( (errno = pthread_barrierattr_destroy(&attr)) )
      |                       ^
3 errors generated.