cabal-version: 2.0
name: pkg-foo
version: 0
build-type: Simple

synopsis: This should work
category: Test

library
  default-language: Haskell2010
  hs-source-dirs: src
  build-depends: base <5, internal-lib
  exposed-modules: Lib

library internal-lib
  default-language: Haskell2010
  hs-source-dirs: internal
  build-depends: base <5
  exposed-modules: InternalLib