Her is a small file (simplified from GlSurf)
that SEGV on FreeBSD 4.3 (with NVidia driver ...) and ocaml-3.07beta2
If you remove the line with thread.yeld it does not SEGV. note:
thread.yeld is not called since Glut.mainLoop is not started, so I am
  puzzled.

Note: all the examples in lablglut distributions appear to work on my 
FreeBSD box and the same program (GlSurf) works on Linux, windows and OSX.

So there is a problem when you use FreeBSD+lablGL/GLUT+thread (you need 
the three of them)

Here is the file:

-- test.ml

     ignore(Glut.init Sys.argv);
     Glut.initDisplayMode ~alpha:true ~double_buffer:true ~depth:true () ;
     Glut.initWindowSize ~w:300 ~h:300;
     ignore (Glut.createWindow ~title:"bug demo");
     Glut.idleFunc (Some Thread.yield);
     print_string "titi";
     print_newline ()

--

And the line used to compile it

ocamlc -o testbug functionstubs.o -thread -labels -I +lablglut -I 
+lablGL -I +threads -pp "camlp4o pa_ifdef.cmo -DUNIX" -thread unix.cma 
threads.cma lablglut.cma lablgl.cma -cclib -lGL -cclib -lGLU -cclib 
-lXmu test.ml
bash-2.05b$ ./testbug
Segmentation fault (core dumped)

-- 
Christophe Raffalli
Université de Savoie
Batiment Le Chablais, bureau 21
73376 Le Bourget-du-Lac Cedex

tél: (33) 4 79 75 81 03
fax: (33) 4 79 75 87 42
mail: Christophe.Raffalli@univ-savoie.fr
www: http://www.lama.univ-savoie.fr/~RAFFALLI
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