I have a web server which load server extensions. these extensions eval-uate configuration files that contains code (user-editable workflow descriptions). The problem is that I need common definitions for the extensions and for the configurration files. This is not permitted by ha-plugins. The minimal code example are the files below. main loads eval.hs , that evaluate a expression. The common definitions are in Include.hs. The error is: *GHCi runtime linker: fatal error: I found a duplicate definition for symbol Include_sum1_srt whilst processing object file /home/magocoal/haskell/devel/votesWorkflow/src/unused/tests/Include.o This could be caused by: * Loading two different object files which export the same symbol * Specifying the same object file twice on the GHCi command line * An incorrect `package.conf' entry, causing some object to be loaded twice. GHCi cannot safely continue in this situation. Exiting now. Sorry. * ** Do you kno how to solve the problem while maintaining the functionality? -------Include.hs------- module Include where sum [x,y]= x+y ------Main.hs----- module Main where import Include import System.Plugins main= do s <-loadExec "eval.o" "mainc" print s loadExec:: String-> String->IO String loadExec file method = do mv <- load file ["."] [] method case mv of LoadSuccess mod v -> v :: IO String LoadFailure msg -> return $ concat msg ------------Eval.hs-------- module Eval(mainc) where import System.IO.Unsafe import System.Eval.Haskell mainc= do i <- unsafeEval_ "sum1 [1,2]" ["Include"] [] []["."] :: IO (Either [String] Int) return $ show i