cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_rwlock_timedwrlock.c -o pthread/pthread_rwlock_timedwrlock -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
pthread/pthread_rwlock_timedwrlock.c:16:16: error: call to undeclared function 'pthread_rwlock_timedwrlock'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   16 |         if ( (errno = pthread_rwlock_timedwrlock(&rwlock, &long_timeout)) )
      |                       ^
pthread/pthread_rwlock_timedwrlock.c:16:16: note: did you mean 'pthread_rwlock_trywrlock'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/pthread.h:470:5: note: 'pthread_rwlock_trywrlock' declared here
  470 | int pthread_rwlock_trywrlock(pthread_rwlock_t *) __DARWIN_ALIAS(pthread_rwlock_trywrlock);
      |     ^
1 error generated.