Prelude.hs?

[Dave at haskell.org]

I have just built and installed Hugs 6.6 on AMD 64-bit OpenBSD 3.9.
It seems to work ok, but I just discovered that the function
primMinInt mentioned on page 13 of _The Haskell Road to Logic, Maths
and Programming_ is not recognized.  I also do not get 'Prelude>'
as the prompt when I invoke hugs. I get 'Hugs>' instead.  How do I
get primMinInt to work?

Thanks,

Dave Feustel