Dependencies in user repository

Dear all, I'm having trouble getting Cabal to find packages installed in my user repository. When I run ghc-pkg list manually, I can see all the required packages, listed in the section for my user repository. When I run ghci I can import said packages as well. Yet when I run ghc on the Setup.hs file of a package which requires said packages, it tells me that the dependencies are missing. It works when I use --package-db to explicitely point it to the user package.conf. Am I missing an extra flag or something like that to make it take the packages in the user repository into account? I'm using Cabal version 1.6.0.1. Thanks, Lars