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incorrectly identifies GNU Emacs 23 as XEmacs 20.x
patch:
3204c3204,3206
< (cond ((boundp 'compilation-error-regexp-alist-alist);; xemacs 20.x
---
> (cond ((and
> (boundp 'compilation-error-regexp-alist-alist);; xemacs 20.x
> (boundp 'compilation-build-compilation-error-regexp-alist))