Hi,

From: "altern" <enrike / altern.org>
>
> This is the second one with  opengl-0.1.32f
[...]
> glu.c:8:19: GL/gl.h: No such file or directory
> glu.c:9:20: GL/glu.h: No such file or directory

I found that on my OS X system, files like gl.h and
glu.h were buried in some obscure directory, like:

/Developer/SDKs/MacOSX10.2.8.sdk/System/Library/blah/blah

so i made a GL directory locally (right next to 
extconf.rb) and copied the following files there:

  gl.h
  glu.h
  glut.h

Hope this helps.... BTW my ruby version on OS X is:

  ruby 1.8.2 (2004-12-24) [powerpc-darwin7.6.0]


Regards,

Bill