>
> I do not propose it to be removed.
> I want it to be explained in the comment
> in the Makefile.

It has been explained when it was added. I did not want to repeat the
same comment again. (see r13095)

>
> I looked at it and it _looks_ like it is not needed.
> Actually, I still don't see why it is needed,

Like errno Its made a TLS variable as a result every thread will have
its own _res and hence the functions altering _res will be thread safe
and have
more deterministic behaviour in multithreaded env.

> but I trust you. My point is, don't you think
> it makes sense to prevent someone else from
> thinking the same six months from now and
> removing it again?
>
> --
> vda
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