*** setup configure

Reading installed packages...
/usr/local/bin/ghc-pkg dump --global
/usr/local/bin/ghc-pkg dump --user
Dependency Cabal >=1.4: using Cabal-1.7.4
Creating setup (and its parents)
/usr/local/bin/ghc -package Cabal-1.7.4 --make Setup.hs -o setup/setup -odir setup -hidir setup
[1 of 1] Compiling Main             ( Setup.hs, setup/Main.o )

Setup.hs:40:40:
    Couldn't match expected type `PackageIndex pkg'
           against inferred type `InstalledPackageIndex'
    In the first argument of `searchByName', namely
        `(installedPkgs lbi)'
    In the expression: searchByName (installedPkgs lbi) "base"
    In the expression:
        case searchByName (installedPkgs lbi) "base" of {
          None -> error "no base package"
          Unambiguous (x : _) -> x
          _ -> error "base ambiguous" }

*** Trying again with preferred-versions

*** setup configure

Reading installed packages...
/usr/local/bin/ghc-pkg dump --global
/usr/local/bin/ghc-pkg dump --user
Dependency Cabal >=1.4: using Cabal-1.7.4
Creating setup (and its parents)
/usr/local/bin/ghc -package Cabal-1.7.4 --make Setup.hs -o setup/setup -odir setup -hidir setup
[1 of 1] Compiling Main             ( Setup.hs, setup/Main.o )

Setup.hs:40:40:
    Couldn't match expected type `PackageIndex pkg'
           against inferred type `InstalledPackageIndex'
    In the first argument of `searchByName', namely
        `(installedPkgs lbi)'
    In the expression: searchByName (installedPkgs lbi) "base"
    In the expression:
        case searchByName (installedPkgs lbi) "base" of {
          None -> error "no base package"
          Unambiguous (x : _) -> x
          _ -> error "base ambiguous" }