Sven Panne
Cannot find constructor for newtype: InfoData 92 NHC.FFI.CPtrdiff IEnone 92 (DataNewType False [])
Cannot find constructor for newtype: InfoData 77 NHC.FFI.CInt IEnone 77 (DataNewType False [])
OK, I've just checked in a new version of include/NHC/FFI.hi, copied directly from the build tree (src/prelude/FFI/FFI.hi) incorporating your recent changes. You will need to ensure that the 'base' library package gets re-built using this new interface: rm targets/`harch`/libraries rm -r targets/`harch`/obj/libraries/base make libraries If it still doesn't work, then it is possible that your application code is importing, re-exporting, then re-importing CPtrdiff() and CInt() abstract, i.e. without their constructors. That can confuse nhc98, which needs the definition info to appear in the interface file, in order to determine what the real underlying type is. This is probably a bug, but one that is not easy to fix without introducing other bugs. The workaround is to mention the constructors on import/export, viz, CInt(..). Regards, Malcolm