Calling pthread_cond_destroy results in "Function not implemented" ENOSYS on macOS - macos

Question

I am trying to make some Linux-based code run on macOS. It is the POSIX OSAL layer for NASA Core Flight System as found here: https://github.com/nasa/osal.
I am observing that the code uses POSIX conditions and in particular, there is a call like the following:
if (pthread_cond_destroy(&(sem->cv)) != 0) {
printf("pthread_cond_destroy %d %s\n", errno, strerror(errno)); // my addition
...
}
On macOS, the tests related to this code provided in the OSAL repository always fail because the call to pthread_cond_destroy always results in:
pthread_cond_destroy 78 Function not implemented
I have found an example in the Apple documentation which shows an example of Using Conditions (Threading Programming Guide / Synchronization / Using Conditions) and in that example there is no call to pthread_cond_destroy but I cannot make any conclusions on whether that call should be there or not because the example is simplified.
This is how the header looks like on my machine:
__API_AVAILABLE(macos(10.4), ios(2.0))
int pthread_cond_destroy(pthread_cond_t *);
I am wondering if pthread_cond_* functionality is simply missing on macOS and I have to implement a replacement for it or there is some way to make it work.
EDIT: The minimal example is working fine for me. The problem should be somewhere around the problematic code. What I still don't understand is why I am getting ENOSYS/78 error code, for one thing it is not mentioned on the man page man/3/pthread_cond_destroy:
#include <iostream>
#include <pthread.h>
int main() {
pthread_cond_t condition;
pthread_cond_init(&condition, NULL);
int result = pthread_cond_destroy(&condition);
assert(result == 0);
assert(errno == 0);
std::cout << "Hello, World!" << std::endl;
return 0;
}