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From: David Moore <dmoore@UCSD.EDU>
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Subject: Re: saving to nnml groups
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Paul Graham <pjg@acsu.buffalo.edu> writes:

> +                (call-process "lockfile" nil nil nil
> +                              (concat ,temp-file ".lock"))
>                  (write-region (point-min) (point-max)
>                                ,temp-file nil 'nomesg)
> +                ;; release the lock
> +                (call-process "rm" nil nil nil "-f"
> +                              (concat ,temp-file ".lock"))

will you be shipping lockfile as well?  I beleive it comes with mh and
procmail, but it's hardly a standard utility (unfortunately).