[Haskell-beginners] Package access problem

[Gregory Guthrie]

I installed diagrams, and it seems to be there, but GHCi doesn't find it. I tried adding the local sandbox to the command line (-package-db),  but still no luck
Any suggestions?

   C:\Users\guthrie>
   C:\Users\guthrie>cabal install diagrams
    Resolving dependencies...
    All the requested packages are already installed:
   diagrams-1.2
   Use --reinstall if you want to reinstall anyway.

I find it in:
   C:\Users\guthrie\.cabal-sandbox\i386-windows-ghc-7.6.3-packages.conf.d
        (diagrams-1.2, diagrams-contrib, -core, -lib, -svg)

But running: "cabal repl" or using the GHC(i) flag "-package-db=..."
fail to find it:

    C:\Users\guthrie>cabal repl
    GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
    Loading package ghc-prim ... linking ... done.
    Loading package integer-gmp ... linking ... done.
    Loading package base ... linking ... done.
    Prelude> :m + Diagrams

    <no location info>:
        Could not find module `Diagrams'
       It is not a module in the current program, or in any known package.
    Prelude> :m + Diagrams.Prelude

    <no location info>:
        Could not find module `Diagrams.Prelude'
       It is not a module in the current program, or in any known package.
    Prelude>
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