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On Wed, 23 Oct 2002, John Paul Wallington wrote:

> The value of the variable `window-system' is `x' under X-Windows,
> `mac' under Carbon, and `tty' for a Terminal.

Correction: window-system is nil on a character terminal.

> Also, it may be better to test for specific capabilities, so that when
> the Carbon build gets them your configuration will use them.  e.g.:
> 
> (if (display-images-p)
>     (auto-image-file-mode t))

That is indeed much, much better than testing the value of window-system.