Hi folks, I am trying to integrate my own preprocessor into a cabal build process. But there are several points that I get stuck with. Could someone help me, please? A simplification of my problem: I have files "Abc.foo" and each of them should be transformed into "Abc.hs" by calling function "transform". The resulting "Abc.hs" files should then be exposed as Haskell library modules. 1. Question: How do I tell cabal that the file Abc.foo belongs to the package? After reading the User's Guide I had the impression that I should write something like Library Eposed-Modules: Abc.foo But this leads to a parse error. Adding a Data-Files: Abc.foo to the heading, on the other hand, does not seem to do anything. 2. Question: How to add the preprocessor? I have tried main = defaultMainWithHooks simpleUserHooks{hookedPreProcessors=[("foo",transformation)]} transformation :: BuildInfo -> LocalBuildInfo -> PreProcessor But under which circumstances will this function be called? Up to now I have not succeeded in making cabal call this function. Thanks for your time! Bernd