Hi, I wanted to give the new SmoothOpenGL3.hs example a try, but I ran into a strange problem with it. Prior to trying this example, I unregistered the old OpenGL and GLUT packages and installed new ones with cabal. Below is a list of all the Haskell packages on my system: $ ghc-pkg list /usr/lib64/ghc-6.10.3/./package.conf: Cabal-1.6.0.3, HUnit-1.2.0.3, QuickCheck-1.2.0.0, X11-1.4.5, array-0.2.0.0, base-3.0.3.1, base-4.1.0.0, bytestring-0.9.1.4, containers-0.2.0.1, directory-1.0.0.3, (dph-base-0.3), (dph-par-0.3), (dph-prim-interface-0.3), (dph-prim-par-0.3), (dph-prim-seq-0.3), (dph-seq-0.3), extensible-exceptions-0.1.1.0, filepath-1.1.0.2, (ghc-6.10.3), ghc-prim-0.1.0.0, haddock-2.4.2, haskell-src-1.0.1.3, haskell98-1.0.1.0, hpc-0.5.0.3, html-1.0.1.2, integer-0.1.0.1, mtl-1.1.0.2, network-2.2.1, old-locale-1.0.0.1, old-time-1.0.0.2, packedstring-0.1.0.1, parallel-1.1.0.1, parsec-2.1.0.1, pretty-1.0.1.0, process-1.0.1.1, random-1.0.0.1, regex-base-0.72.0.2, regex-compat-0.71.0.1, regex-posix-0.72.0.3, rts-1.0, stm-2.1.1.2, syb-0.1.0.1, template-haskell-2.3.0.1, time-1.1.3, unix-2.3.2.0, xhtml-3000.2.0.1, xmonad-0.8.1 /home/plouj/.ghc/x86_64-linux-6.10.3/package.conf: GLURaw-1.0.0.0, GLUT-2.2.0.0, ObjectName-1.0.0.0, OpenGL-2.3.0.0, OpenGLRaw-1.0.1.0, SDL-0.5.5, StateVar-1.0.0.0, Tensor-1.0.0.1, X11-xft-0.3, hinotify-0.2, utf8-string-0.3.5, xmonad-contrib-0.8.1 I copied SmoothOpenGL3.hs from the GLUT-2.2.0.0.tar.gz tarball into the current directory and here is what happened when I tried running it with runghc: $ runghc SmoothOpenGL3.hs SmoothOpenGL3.hs: /home/plouj/.cabal/lib/GLUT-2.2.0.0/ghc-6.10.3/HSGLUT-2.2.0.0.o: unknown symbol `glutGet' SmoothOpenGL3.hs: SmoothOpenGL3.hs: unable to load package `GLUT-2.2.0.0' $ ghc-pkg list|grep GLUT GLURaw-1.0.0.0, GLUT-2.2.0.0, ObjectName-1.0.0.0, OpenGL-2.3.0.0, $ nm /home/plouj/.cabal/lib/GLUT-2.2.0.0/ghc-6.10.3/HSGLUT-2.2.0.0.o|grep glutGet 0000000000007720 D GLUTzm2zi2zi0zi0_GraphicsziUIziGLUTziState_ptrzuglutGetModeValues_closure 0000000000045060 T GLUTzm2zi2zi0zi0_GraphicsziUIziGLUTziState_ptrzuglutGetModeValues_info U glutGet U glutGetColor U glutGetMenu U glutGetModifiers U glutGetProcAddress U glutGetWindow I get a similar problem in ghci: $ ghci GHCi, version 6.10.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Prelude> :l SmoothOpenGL3.hs [1 of 1] Compiling Main ( SmoothOpenGL3.hs, interpreted ) Ok, modules loaded: Main. *Main> main Loading package syb ... linking ... done. Loading package base-3.0.3.1 ... linking ... done. Loading package array-0.2.0.0 ... linking ... done. Loading package containers-0.2.0.1 ... linking ... done. Loading package OpenGLRaw-1.0.1.0 ... linking ... done. Loading package GLURaw-1.0.0.0 ... linking ... done. Loading package ObjectName-1.0.0.0 ... linking ... done. Loading package StateVar-1.0.0.0 ... linking ... done. Loading package Tensor-1.0.0.1 ... linking ... done. Loading package OpenGL-2.3.0.0 ... linking ... done. Loading package GLUT-2.2.0.0 ... linking ... <interactive>: /home/plouj/.cabal/lib/GLUT-2.2.0.0/ghc-6.10.3/HSGLUT-2.2.0.0.o: unknown symbol `glutGet' ghc: unable to load package `GLUT-2.2.0.0' Finally, this is what I get if I try to compile with 'ghc --make': $ ghc --make -lglut SmoothOpenGL3.hs # the linker fails without -lglut similar to this: http://www.haskell.org/pipermail/hopengl/2008-September/000756.html [1 of 1] Compiling Main ( SmoothOpenGL3.hs, SmoothOpenGL3.o ) Linking SmoothOpenGL3 ... $ ./SmoothOpenGL3 SmoothOpenGL3: user error (unknown GLUT call glutInitContextVersion, check for freeglut) $ ldd ./SmoothOpenGL3 linux-vdso.so.1 => (0x00007fffd25ff000) libglut.so.3 => /usr/lib64/libglut.so.3 (0x000000323c000000) libGLU.so.1 => /usr/lib64/libGLU.so.1 (0x0000003242000000) libGL.so.1 => /usr/lib64/libGL.so.1 (0x0000003241c00000) libm.so.6 => /lib64/libm.so.6 (0x0000003239400000) libgmp.so.3 => /usr/lib64/libgmp.so.3 (0x000000323bc00000) libdl.so.2 => /lib64/libdl.so.2 (0x0000003239800000) librt.so.1 => /lib64/librt.so.1 (0x000000323a400000) libc.so.6 => /lib64/libc.so.6 (0x0000003239000000) libXext.so.6 => /usr/lib64/libXext.so.6 (0x000000323b400000) libX11.so.6 => /usr/lib64/libX11.so.6 (0x000000323a800000) libXxf86vm.so.1 => /usr/lib64/libXxf86vm.so.1 (0x0000003248a00000) libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003243e00000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003241000000) libXdamage.so.1 => /usr/lib64/libXdamage.so.1 (0x000000323ec00000) libXfixes.so.3 => /usr/lib64/libXfixes.so.3 (0x000000323cc00000) libdrm.so.2 => /usr/lib64/libdrm.so.2 (0x0000003242400000) libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003239c00000) /lib64/ld-linux-x86-64.so.2 (0x0000003238c00000) libXau.so.6 => /usr/lib64/libXau.so.6 (0x000000323ac00000) libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x000000323b000000) I'm not sure if this problem is specific to my setup or if it's a bug in the new GLUT/OpenGL packages. I would appreciate any help either way. -- http://plouj.com/