This reverts commitdfb0f25484, reversing changes made to7f8ff02437. These changes broke the ghcWithPackages wrapper: nix-shell -p "haskellPackages.ghcWithPackages (ps: [ps.mtl])" --run "ghc-pkg list mtl" /nix/store/szz84j5k1dy3jdashis6ws28d8l8zxxb-ghc-8.0.2-with-packages/lib/ghc-8.0.2/package.conf.d (no packages)