I'm using HUnit (http://hunit.sf.net/) I think the snegate, gnegate, and pnegate are type specialized tracing functions. Hat can't find fnegate, and the source before rewriting points to a handle, stdout I think. Or maybe I'm just missing something? Here's the error: shae@thunderbird:..tedHaskell/TwistedHaskell > hmake -ghc -hat -package data -package hat -i/home/shae/src/haskell/libraries -i/home/shae/build/haskell/hat/hat-2.00/src/hat/lib Test_Banana.hs hat-trans /home/shae/src/haskell/libraries/HUnitText.lhs Wrote /home/shae/src/haskell/libraries/THUnitText.hs ghc -package data -package hat -i/home/shae/src/haskell/libraries -i/home/shae/build/haskell/hat/hat-2.00/src/hat/lib -c -package hat -o /home/shae/src/haskell/libraries/THUnitText.o /home/shae/src/haskell/libraries/THUnitText.hs /home/shae/src/haskell/libraries/THUnitText.hs:64: Variable not in scope: `TPrelude.fnegate' zsh: exit 1 hmake -ghc -hat -package data -package hat -i/home/shae/src/haskell/libraries -- Shae Matijs Erisson - http://www.webwitches.com/~shae/ <radix> shapr: I think you *are* a purist :) <radix> shapr: it's just that you're morally against unstable software, instead of morally against MS, or non-free software, or whatnot.