> is returned non-zero.
> 
> However, the name _PC_HAS_HIDDENSYSTEM is misleading,
> so what do others think I should do?
> - Add an alias for _PC_HAS_HIDDENSYSTEM called something
>  like _PC_HAS_HIDSYSARCH or _PC_HAS_HIDDENSYSTEMARCHIVE?
> (Since _PC_HAS_HIDDENSYSTEM is now in the OpenZFS code, it
> needs to remain in unistd.h, at least for now.)

> Or
> - Just leave the name as is and document it correctly in pathconf(2)?
IMO the 'just leave' action is good enough.