hugs98 on macports

Hi,

I've installed hugs98 (version September 2006) using macports on  
Leopard and I'm having a few problems when I try to load code that  
contains: import Graphics.SOE (I'm typing in programs from the School  
of Expression book by Paul Hudak). I get the error:

ERROR "/opt/local/lib/hugs/packages/HGL/Graphics/HGL/Internals/ 
Types.hs" - Can't find imported module "Graphics.X11.Xlib"

Apart from this, Hugs seems to run okay. Any ideas on how to fix this?

C