If you need an update of a package to make it build/run on GHC 6.12.1, or if you have modified someone else's package to do so, please feel free to use this wiki page to coordinate: http://haskell.org/haskellwiki/Patches_and_forks_for_GHC_6.12 I suggest that those who have patches to contribute add a link to their patches or forks from that page[*], *and* submit their patches to the package maintainer(s). That way, we can avoid duplication of effort, while not having to wait for package maintainers to get around to applying our patches. This may sound trivial, but it can be annoying waiting for a whole chain of packages to "catch up" before you can even build your own package. So you may end up fixing other people's packages - which can easily lead to substantial duplication of effort. [*] or you can email me links/patches and I'll add them for you