agent.cabal

name:                agent
version:             0.1.0.0
synopsis:            Just testing
author:              Dimitri DeFigueiredo
maintainer:          defigueireo@ucdavis.edu
build-type:          Simple
cabal-version:       >=1.20

----------------------------------------------
executable myAgent
   main-is:              Main.hs
   build-depends:        base, unix
   default-language:     Haskell2010

----------------------------------------------
executable myPersonalMain
     main-is:            Mpm.hs
     build-depends:      base
     default-language:   Haskell2010

Main.hs

module Main where
main = putStrLn "main"

Mpm.hs

module Mpm where

-- This import fails because the dependency on "unix" for "main" is not global,
-- and thus not made available to "myPersonalMain".
import System.Posix

main = putStrLn "Hi!"