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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: spam.el and missing functions
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pinard@iro.umontreal.ca (François Pinard) writes:

> [Jesper Harder]
>
>> I don't think I understand why a compatibility function is needed.
>> Doesn't both Emacs and XEmacs have 'executable.el'?
>
> I do not know about now, but when I wrote it, this surely was because
> I stumbled on some [X]Emacs which did not have the function.  I'm not
> enough of an academician for creating solutions and problems all at
> once...  :-).

I guess it would have to be XEmacs since Emacs doesn't have
`locate-file'.  

Anyway, `executable-find' is autoloaded in several other Gnus files:
binhex.el, uudecode.el, mm-decode.el et al.  So, it probably doesn't
break anything (that's not already broken) to use the same method in
spam.el.