The ghc-binary package is used internal to GHC, and isn't gauranteed to be present from one version to the next, nor do I expect the GHC team to promise it will have a stable interface. You'd really be better of instaling the package "binary", or something similar. On Mar 14, 2011 5:34 AM, "Christian Maeder" <Christian.Maeder@dfki.de> wrote: