> Date: Mon, 16 Sep 2019 18:08:23 -0700
> From: Palmer Dabbelt <pal...@dabbelt.com>
> Cc: Palmer Dabbelt <pal...@dabbelt.com>
> 
> +#ifdef HAVE_UNISTD_H
> +      if (nice(0) == nice(arg_nice))
> +#endif

This is not portable enough, because having unistd.h doesn't yet mean
you have 'nice'.  E.g., MinGW, which produces native MS-Windows
programs, does have unistd.h, but no 'nice'.

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