If you use `x-face-mule.el' in bitmap-mule (ftp://ftp.jpl.org/pub/elisp/bitmap/) 8.0 or later, do the following:
(autoload 'x-face-decode-message-header "x-face-mule") (setq wl-highlight-x-face-function 'x-face-decode-message-header)
With Emacs 21.x, you can use `x-face-e21.el' (ftp://jpl.org/pub/elisp/) instead of `x-face-mule.el' to display X-Face. In this case, bitmap-mule is not required. Do as follows:
(autoload 'x-face-decode-message-header "x-face-e21") (setq wl-highlight-x-face-function 'x-face-decode-message-header)
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