cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_mutex_timedlock.c -o pthread/pthread_mutex_timedlock -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
pthread/pthread_mutex_timedlock.c:16:16: error: call to undeclared function 'pthread_mutex_timedlock'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   16 |         if ( (errno = pthread_mutex_timedlock(&mtx, &long_timeout)) )
      |                       ^
pthread/pthread_mutex_timedlock.c:16:16: note: did you mean 'pthread_mutex_trylock'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/pthread.h:401:5: note: 'pthread_mutex_trylock' declared here
  401 | int pthread_mutex_trylock(pthread_mutex_t *);
      |     ^
1 error generated.