Thanks Kazuya, that link is perfect. Basically, I have to explicitly add -lglut : ghc -package GLUT -lglut HelloWorld.hs -o HelloWorld Great. GLUT (and now FreeGLUT) remains the simplest and most reliable "standard" cross-platform OpenGL windowing API. (It seems from the link that the information used by ghc-pkg is wrong, and stems from the GLUT package's relationship to libraries known as Xmu and Xi.) Cheers, Paul -----Original Message----- From: Kazuya Sakakihara [mailto:kazuya@gmail.com] Sent: Thu 22/01/2009 02:14 To: Paul Keir Cc: haskell-cafe@haskell.org Subject: Re: [Haskell-cafe] GLUT (glutGet undefined reference)[MESSAGE NOT SCANNED] Check this thread: http://groups.google.com/group/fa.haskell/browse_thread/thread/1716fa5e56435... Kazuya 2009/1/20 Paul Keir :

Hi all,

I was hoping to introduce my old pal OpenGL with my new chum, Haskell. I used cabal to install GLUT on my 64-bit Ubuntu machine with GHC 6.8.2 (installed via apt-get/synaptic).

I followed the wiki OpenGLTutorial1 until: ghc -package GLUT HelloWorld.hs -o HelloWorld at which point my screen is filled with errors. The errors begin with:

/home/paul/.cabal/lib/GLUT-2.1.1.2/ghc-6.8.2/libHSGLUT-2.1.1.2.a(Begin.o): In function `szEn_info': (.text+0x26c): undefined reference to `glutGet'

This surprised me a little because I've already seen these same errors recently on two separate Windows boxes. Somehow I'd got the idea it was (on Windows) due to installing from a binary; though I guess the story is the same with apt-get. Should I look for an apt-get switch to reinstall GHC from source instead?

Regards, Paul

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