Re: GHC Error in linker "undeined reference"

Hi, On 8/12/06, Johan Grönqvist wrote:

import Control.Monad.State import Control.Monad.ST import Data.Array.ST import Data.List

Control.Monad.State is from package mtl, the other modules are part of the base package, I think.

ubuntu@ubuntu:~/haskell/Forth$ ghc forth.lhs

You need to tell ghc that you want to link package mtl. ghc -package mtl forth.lhs or more automatic ghc --make forth.lhs The packages you can import without any additional options are the packages "ghc-pkg list" shows as visible. But without --make, or explicitly telling, ghc doesn't know which packages to link with. HTH, --Esa