cc -O2 -pipe  -pthread  -Wall -Wextra -Werror=implicit-function-declaration pthread/pthread_condattr_getpshared.c -o pthread/pthread_condattr_getpshared -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread 
pthread/pthread_condattr_getpshared.c:14:16: error: call to undeclared function 'pthread_condattr_getpshared'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
   14 |         if ( (errno = pthread_condattr_getpshared(&attr, &shared)) )
      |                       ^
pthread/pthread_condattr_getpshared.c:14:16: note: did you mean 'pthread_rwlockattr_getpshared'?
/usr/include/pthread.h:250:6: note: 'pthread_rwlockattr_getpshared' declared here
  250 | int             pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *,
      |                 ^
1 error generated.