I asked:
> What solution can you offer so that
>   - in < 10.5, we have no error,
>   - in >= 10.5, proc_pidinfo gets used?

Would this work?

int proc_pidinfo (int, int, uint64_t, void *, int) WEAK_IMPORT_ATTRIBUTE;

if (proc_pidinfo != NULL)
  {
    ... code that invokes proc_pidinfo ...
  }

Based on [1].

Bruno

[1] 
https://opensource.apple.com/source/dyld/dyld-44.17/unit-tests/test-cases/weak-symbol/




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