[Haskell-beginners] hidden packages and ambiguous modules

Hi, I have ghc version 7.6.3. I am trying to compile some code (not mine) with $ ghc --make Main and get the message: Could not find module `Time' It is a member of the hidden package `haskell98-2.0.0.2'. Then I tried: $ ghc -package haskell98-2.0.0.2 --make Main resulting in Ambiguous module name `Prelude': it was found in multiple packages: base haskell98-2.0.0.2 At this point I am stuck. How do I load the right packages without introducing ambiguities? Thanks! Greetings, Dimitri