cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_rwlockattr_setpshared.c -o pthread/pthread_rwlockattr_setpshared -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
pthread/pthread_rwlockattr_setpshared.c: In function ‘main’:
pthread/pthread_rwlockattr_setpshared.c:42:22: error: ‘PTHREAD_PROCESS_SHARED’ undeclared (first use in this function)
   42 |         int shared = PTHREAD_PROCESS_SHARED;
      |                      ^~~~~~~~~~~~~~~~~~~~~~
pthread/pthread_rwlockattr_setpshared.c:42:22: note: each undeclared identifier is reported only once for each function it appears in
pthread/pthread_rwlockattr_setpshared.c:46:23: error: implicit declaration of function ‘pthread_rwlockattr_setpshared’; did you mean ‘pthread_rwlockattr_destroy’? [-Wimplicit-function-declaration]
   46 |         if ( (errno = pthread_rwlockattr_setpshared(&rwlockattr, shared)) )
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                       pthread_rwlockattr_destroy