Hi, Thanks for the help and patches for Haskell protocol-buffers/hprotoc. I have updated this to version 1.8.3 on hackage and the darcs repository may lag a few days. The program is working for me with ghc-7.0.2 on Haskell Platform (64-bit!) for OS X. Generated files now include LANGUAGE headers that I hope have the all the needed flags. The generated files have an internal change where the Prelude and protocol-buffer libraries are now imported under different qualified names. I have tested this but I may have missed something. Package protocol-buffers-descriptor has been built against the descriptor.proto from google's version 2.4.0 but the supported features are still on par with google version 2.3.0. In particular I have not tried to add syntax support for the new way of specifying default options of message type. Does anyone need this? Cheers, Dr. Chris Kuklewicz