Windows Install Issues for erf (and statistics)

The package statistics uses the package erf. Doing cabal install statistics works fine but when I try to use anything I get:

Loading package syb ... linking ... done. Loading package base-3.0.3.0 ... linking ... done. Loading package erf-1.0.0.0 ... linking ... <interactive>: C:\Program Files\Haskell\erf-1.0.0.0\ghc-6.10.1\HSerf-1.0.0.0.o: unknown symbol `_erfc' : unable to load package `erf-1.0.0.0'

I assume that erf is looking for some C functions which are available on linux but not windows. I'm not sure what the solution is. Should cabal complain? Should there be some documentation on the erf homepage telling windows users what to do? Or at least that it doesn't work on windows? Dominic.