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    >     * Convert the XPM bitmaps to PPM, replace the PBMs with them and scrap
    >       the XPMs so that the colour versions work generally.  (Requires care
    >       with the colour used for the transparent regions.)
    > 
    > Could someone explain what good this would do?  I don't know much
    > about these image formats.

    The PPM format is supported by all Emacsen, whereas the XPM format
    is only supported if you have the libXpm library.

Are you saying that we simply have to convert all the images to PPM
form, and they will work as well as they do now and work portably?