cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/pthread_cond_clockwait.c -o pthread/pthread_cond_clockwait -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
pthread/pthread_cond_clockwait.c:5:111: error: use of undeclared identifier 'pthread_cond_clockwait'
int (*foo)(pthread_cond_t *restrict, pthread_mutex_t *restrict, clockid_t, const struct timespec *restrict) = pthread_cond_clockwait;
                                                                                                              ^
1 error generated.