[Haskell-cafe] Compiling non-registered packages into a sandbox?

Hi all, How do I compile a non-Hackage registered package into a local sandbox? Let’s say I have: /proj_dir/ - .cabal-sandbox/ - cabal.sandbox.config - dep_pkg/ - dep_pkg.cabal - Setup.lhs - … I’d like to compile the dep_pkg package into my proj_dir sandbox; can I do this, if dep_pkg is NOT registered with Hackage? If so, how? Thanks, -db