Some more bad news... The Cabal hooks interface from 6.4.2 is pretty different from the current darcs head. The differences were to make things more consistent and less likely to change in the future. I can't see really going back to the version that's in 6.4.2. I fear that'll make the problem worse in the long run. So for clarity, the problem with this difference is that folks who rely on the hooks may have trouble building their Setup files due to different interfaces between cabal versions. So having a version of GHC with a different cabal hooks interface from future versions will be a problem. But IMO using that interface in the long run will be a bigger problem, since it's not a particularly good interface. My inclination is to just go ahead and change it for 1.1.5 and greater... this will cause some pain for those who rely on the GHC 6.4.2 version of the interface (which we're calling cabal 1.1.4), but hopefully it won't be a huge number of packages. Opinions? peace, isaac