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Stainless Steel Rat <ratinox@peorth.gweep.net> writes:

> Note: it uses `count-lines-buffer' from simple.el, which might not be part
> of FSF Emacs (it is part of XEmacs).  If this is the case, does FSF Emacs
> have a more or less equivalently useful function, or am I going to have to
> roll my own?

FSF emacs doesn't have it.

I tend to use

(count-lines (point-min) (point-max))

in the appropriate buffer. I don't know if there's a nicer way.