Can't find includes to silence warnings

[kaf8 at aber.ac.uk (Kim Foo-Jones)]

On Saturday, March 2, 2002, at 09:43 , Matt Watson wrote:

> On Saturday, March 2, 2002, at 01:15  PM, Finlay Dobbie wrote:
>
>> #include <unistd.h> (or #import if you're using Obj-C).
>
> Don't #import <unistd.h> -- it already has multiple-include protection:
>
> #ifndef _UNISTD_H_
> #define _UNISTD_H_

Why is it necessary to avoid #import in this case?

Thanks,

-Kim