You need one specific to 5.8 as it is not binary compatible with 5.6. crazyinsomniac maintains a ppm repository that often has useful modules but he only has Curses for 5.6. If you /msg him he may do a 5.8 version or tell you how easy it (is not) to compile.

You could of course just install 5.6 which is fine unless you want some rather specific widgets that appeared in 5.8.