Then how does the 'Executable' section of your .cabal look like? That's what I can't get working.
Suitably elided. Executable test hs-source-dirs: src, tests other-modules: Text.Yaml.Yay, Text.Yaml.Yay.Syck main-is: Main.hs build-depends: base, HsSyck, syb if flag(test) build-depends: QuickCheck >= 2.1 && < 2.2, test-framework-quickcheck2 >= 0.2 && < 0.3, test-framework >= 0.2 && < 0.3 else buildable: False Library Hs-Source-Dirs: src Exposed-Modules: Text.Yaml.Yay, Text.Yaml.Yay.Syck Other-Modules: Text.Yaml.Yay.Internal.Utils, Text.Yaml.Yay.Syck.Encoder, Text.Yaml.Yay.Syck.Decoder Build-Depends: base, HsSyck, syb if flag(test) -- Faster builds ghc-options: -O0 else -- Optimized builds ghc-options: -O2 if flag(nolib) buildable: False