Nicolas Oury wrote:

...

Hello, is there a version of hopengl working with ghc 5.04? [...]

I guess you mean the latest and greatest GHC 5.04.2, because earlier versions work quite well with HOpenGL 1.03. Although 5.04.2 is supposed to be a patchlevel release without noticeable API changes, it isn't really: GHC's FFI has been synchronized with the FFI addendum, and there are some subtle changes, e.g. ForeignObjs can't be passed to external functions anymore.

That's not true - 5.04.2 still supports ForeignObj as an argument to a foreign function. The functionality has been removed in the HEAD, though. I'm not aware of any API changes in 5.04.2 relative to 5.04.1. Cheers, Simon