My student and I recently published four Reactive demos at, http://formicite.com/dopage.php?frp/frp.html All four work well on GHC 6.10 but one user had trouble with the two GLUT demos on GHC 6.12.1. We have fixed our modules and hacked a fix for reactive-glut (which we have included in our code just to get it working again). Most of the issues revolve around GLdouble and Double. To get it working we changed one line of code in SimpleGL.hs 117c117 < f maxZ z = realToFrac (z - (maxZ `div` 2)) / 100 ---

f maxZ z = realToFrac (z - (((fromIntegral maxZ)::GLint) `div` 2)) / 100

and removed 'Test.hs' requirement from the cabal setup as we weren't able to figure out how to fix it. Here's a snippit of our ghc-pkg list .. .. .. GLURaw-1.1.0.0 GLUT-2.2.2.0 HTTP-4000.0.8 MemoTrie-0.4.7 ObjectName-1.0.0.0 OpenGL-2.4.0.1 OpenGLRaw-1.1.0.1 .. .. .. reactive-0.11.4 reactive-glut-0.1.9 unamb-0.2.2 vector-space-0.6.2 zlib-0.5.2.0 .. .. .. Note: On the website the downloads labeled '...V2' are the ones with the hacks. Any thoughts appreciated on how to proceed. Thanks, Tom and Tony