Someone has tried to parallelize Lennart's Haskell from my ray tracer language comparison and they are claiming awesome performance results for Haskell, even beating HLVM: http://poorlytyped.blogspot.com/2010/01/haskell-ray-tracing-parallel.html Frankly, I don't believe their claims for a second. So I'd like to test their code for myself. However, apparently their code needs some third-party library that can be installed with: cabal install AC-Vector but, on my machine, that only seems to make the library accessible to GHC 6.10 and not to GHC 6.12 (which is needed to compile this benchmark). What is the easiest way for me to get this library working under GHC 6.12? -- Dr Jon Harrop, Flying Frog Consultancy Ltd. http://www.ffconsultancy.com/?e