>>>> "Uwe" == Uwe Brauer <oub(a)mat.ucm.es>
writes: 
    Uwe> Ok, I think I go for that, but isn't it that unless is
    Uwe> relative recent and (if (not (featurep 'xemacs) might be the
    Uwe> more robust solution.
`when' and `unless' have been in C in XEmacs since 1995 or so.  GNU
Emacs was a little more conservative, but for practical purposes
there's so much code that uses them, they're pretty sure to be
available in your environment.
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