It wouldn't surprise me at all if the extcore library only worked with GHC versions less than 7. I don't have sufficiently good Internet access to download 7.0.3 right now, but once I do, I'll see what's going on. Just didn't want you to think your question had disappeared into the aether :-) Cheers, Tim -- Tim Chevalier * http://catamorphism.org/ * Often in error, never in doubt “I cannot hide my anger to spare you guilt, nor hurt feelings, nor answering anger; for to do so insults and trivializes all our efforts. Guilt is not a response to anger; it is a response to one’s own actions or lack of action.” -- Audre Lorde