cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_barrier_destroy.c -o pthread/pthread_barrier_destroy -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
pthread/pthread_barrier_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_barrier_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_barrier_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_barrier_destroy.c:12:19: error: expected ';' after expression
   12 |         pthread_barrier_t barrier;
      |                          ^
      |                          ;
pthread/pthread_barrier_destroy.c:12:2: error: use of undeclared identifier 'pthread_barrier_t'
   12 |         pthread_barrier_t barrier;
      |         ^
pthread/pthread_barrier_destroy.c:12:20: error: use of undeclared identifier 'barrier'
   12 |         pthread_barrier_t barrier;
      |                           ^
pthread/pthread_barrier_destroy.c:13:16: error: call to undeclared function 'pthread_barrier_init'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   13 |         if ( (errno = pthread_barrier_init(&barrier, &attr, 2)) )
      |                       ^
pthread/pthread_barrier_destroy.c:13:38: error: use of undeclared identifier 'barrier'
   13 |         if ( (errno = pthread_barrier_init(&barrier, &attr, 2)) )
      |                                             ^
pthread/pthread_barrier_destroy.c:15:16: error: call to undeclared function 'pthread_barrier_destroy'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   15 |         if ( (errno = pthread_barrier_destroy(&barrier)) )
      |                       ^
pthread/pthread_barrier_destroy.c:15:16: note: did you mean 'pthread_attr_destroy'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/pthread.h:230:5: note: 'pthread_attr_destroy' declared here
  230 | int pthread_attr_destroy(pthread_attr_t *);
      |     ^
pthread/pthread_barrier_destroy.c:15:41: error: use of undeclared identifier 'barrier'
   15 |         if ( (errno = pthread_barrier_destroy(&barrier)) )
      |                                                ^
9 errors generated.