Not sure if this is a bug that I should file on Trac or if this is just a newbie mistake... Here's the error during cabal install: Resolving dependencies... Configuring FieldTrip-0.2.7... Preprocessing library FieldTrip-0.2.7... Building FieldTrip-0.2.7... [ 1 of 17] Compiling Graphics.FieldTrip.ParamSurf ( src/Graphics/FieldTrip/ParamSurf.hs, dist/build/Graphics/FieldTrip/ParamSurf.o ) [ 2 of 17] Compiling Graphics.FieldTrip.Transform ( src/Graphics/FieldTrip/Transform.hs, dist/build/Graphics/FieldTrip/Transform.o ) [ 3 of 17] Compiling Graphics.FieldTrip.Vector2 ( src/Graphics/FieldTrip/Vector2.hs, dist/build/Graphics/FieldTrip/Vector2.o ) src/Graphics/FieldTrip/Vector2.hs:29:48: Module `Graphics.Rendering.OpenGL.GL.CoordTrans' does not export `Vector2(..)' cabal: Error: some packages failed to install: FieldTrip-0.2.7 failed during the building phase. The exception was: ExitFailure 1 I have all the dependencies installed, so I don't think that's the problem...