you're going to need a much older version of gd, if not, hold on a little while longer and will most likely come back.
note this quote from the GD library FAQ:
"When will you put GIF support back into gd?
Many have asked whether gd will support reading and creating GIF files again, since we have passed June 20th, 2003, when the well-known Unisys LZW patent expired in the US. Although this patent has expired in the United States, this patent does not expire for another year in the rest of the world. Since I have no way of limiting distribution of GIF-reading-and-creating code to US users only that is guaranteed to please somebody else's lawyer, I have opted to follow the same policy that the ImageMagick authors are following: GIF support will not reappear in gd until the patent expires world-wide on July 7th, 2004. I realize this situation is frustrating for many; please direct your anger and complaints toward the questionable patent system that allows the patenting of such straightforward algorithms in the first place. Thank you!"