On Feb 09 09:49:35, mill...@openbsd.org wrote:
> On Sun, 09 Feb 2020 17:46:51 +0100, Jan Stary wrote:
> > Whenever unistd.h declares getopt(3), it also declares
> > the extern optind and optarg, so files including unistd.h
> > don't need to declare those themselves, right?
> Correct.  Most of those date back from before optind and optarg
> were defined for you by unistd.h.

But the externs should be mentioned in the manpage, right?
That's the only place they are mentioned before being talked about
in the text; although I suspect that's why people keep declaring them
in source code - it's what SYNOPSIS said.


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