Re: fltk backend and undefined gluOrtho2D

[JSampaio57]

I had the same problem. I could compile with no problem after installing
libftgl-dev.
Cheers...
Jorge


Jeff Keacher wrote:
> 
> 
> John W. Eaton-3 wrote:
>> 
>> On 21-Jul-2009, teuobk wrote:
>> 
>> | John W. Eaton-3 wrote:
>> | > 
>> | > On 16-Jul-2009, Alexander Barth wrote:
>> | > 
>> | > | Hi all,
>> | > | I try to compile a recent checkout of octave (from
>> | > | http://www.octave.org/hg/octave). The compilation fails at:
>> | > | 
>> | > | ./DLD-FUNCTIONS/fltk_backend.cc: In member function �3u=1rxvirtual
>> void
>> | > | OpenGL_fltk::draw_overlay()�3u=1ry:
>> | > | ./DLD-FUNCTIONS/fltk_backend.cc:145: error:
>> �3u=1rxgluOrtho2D�3u=1ry was not
>> | > | declared in this scope
>> | > | 
>> | > | I have fltk version 1.1.7. Is this version recent enough? On my
>> system
>> | > | gluOrtho2D is declared in /usr/include/GL/glu.h but this file is
>> not
>> | > | included in fltk_backend.cc.
>> | > 
>> | > On my system, /usr/include/GL/glu.h is part of the libglu1-mesa-dev
>> | > package, and the version of that package is 7.0.3.  I also have
>> | > version 1.1.9 of libfltk1.1-dev. 
>> | > 
>> | 
>> | Ran into this problem, too.  I have fltk 1.1.9 on an Intrepid-release
>> Ubuntu
>> | box, and I was trying to compile Octave 3.2.0 from source.  My solution
>> was
>> | to edit fltk_backend.cc to #include <FL/glu.h> .  Now everything builds
>> | fine, and all of the integrated tests pass.
>> 
>> Strange that you need to include this file and I don't.  Does anyone
>> know why that might be?
>> 
>> At least on my system, the file FL/glu.h doesn't appear to declare
>> gluOrtho2D directly, but gets the declaration when it includes
>> GL/glu.h.
>> 
>> The file src/DLD-FUNCTIONS/fltk_backend.cc includes gl-render.h which
>> includes GL/glu.h if it exists.  So if everything is configured
>> correctly, I think the symbol gluOrtho2D should be defined correctly,
>> and no changes should be required.
>> 
>> Does your system have GL/glu.h?  Does it provide a declaration for
>> the gluOrtho2D function?  Does Octave's configure script find GL/glu.h
>> and define HAVE_GL_GLU_H on your system?
>> 
> 
> Indeed, gluOrtho2D is declared in GL/glu.h.  I included it (indirectly)
> via FL/glu.h mainly for consistency with the other includes in that file,
> which tend to pull from the FL directory.
> 
> Curiously, Octave's configuration script seems to find GL/glu.h, as it
> defines HAVE_GL_GLU_H.  Since that is defined, GL/glu.h should be included
> via gl-render.h, which of course is included conditionally if
> HAVE_GL_GLU_H is defined -- but that didn't seem to be happening.
> 
> To make matters worse, I backed out the change to fltk_backend.cc, ran
> make clean, and tried the build again in an attempt to reproduce the
> problem.  This time the build completed without errors.  Odd.  I assume
> that something is sticking around from the previous builds, but I'm not
> sure what it could be.
> 
> Jeff
> 

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