Making Amiga IFF thumbnails work inLinux

I was having an email conversation with Stoo Cambridge, and he mentioned that he was having trouble making his Linux machine display thumbnails of Amiga IFF/ILBM files. It turns out I have a solution for him, so I am sharing it here to help anyone else.

The number of people to whom this is relevant must be minute, but that's exactly what why it's perfect OSNews material.