Using the hugs Haskell interpreter and the graphics package,
polygons don't draw on the screen properly for one of the
examples. As a test, I tried it remotely on a NetBSD box and directly
on the NetBSD box.
The polygons draw on a NetBSD box running XFree86, but not when
forwarding the session to my Mac running XFree86-4.3.0 (from fink).
OS is X 10.2.6.
I am including the haskell source file.