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Picon Requirements
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To use have Gnus display Picons for you, you must be running XEmacs
19.13 or greater since all other versions of Emacs aren't yet able to
display images.
Additionally, you must have `xpm' support compiled into XEmacs.
If you want to display faces from `X-Face' headers, you must have
the `netpbm' utilities installed, or munge the
`gnus-picons-convert-x-face' variable to use something else.