> This is due to a change in how FFI imports and newtypes work. GHC was
> recently changed to not allow you to use newtypes in FFI imports unless the
> constructor of the newtype is in scope. This broke quite a few libraries. I
> have patched a few of them and I've sent a patch to the zlib maintainer.

This seems like a big change.  Where should I be watching to know
about this ahead of time?  I bet I have to fix some of my packages.