Sorry for the long period of silence, but I'm currently slowly recovering from a head crash (my hard disk's head, to be exact, not *mine* :-). I'm going to re-implement HOpenGL based on the .spec files and the new FFI, moving to the new library hierarchy on the way. So I'm seeking advice where to put it exactly. My suggestion: The GL/GLU modules reside into the subtrees Graphics.Drawing.OpenGL.GL Graphics.Drawing.OpenGL.GLU with 2 modules of the same names, re-exporting the modules from the subtrees. A module Graphics.Drawing.OpenGL re-exports those two modules again. The GLUT modules reside in Graphics.UI.GLUT, with a module of the same name, re-exporting the modules below it plus Graphics.Drawing.OpenGL (Graphics.UI.OpenGL.GLUT looks a little bit like overkill, IMHO). I'm a little bit unhappy with "Drawing", "Rendering" would be more appropriate, but I could live with that... Comments/suggestions? Cheers, S.