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Date:	Sat, 4 Sep 2010 19:16:28 -0400
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Subject:	Re: OpenGL linking problems
From:	David Doria <daviddoria AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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> Well, we need more info to help us help you. What kind of application are=
 you trying to build? X11 or native? There are 2 ways to build OpenGL-relat=
ed programs:
>
> 1- Using native OpenGL, with driver supported hardware acceleration. For =
that, you need some way to
> get a graphic device context. One portable way to do that is to use the G=
LUT library, provided by
> the opengl package that I maintain. Look at the doc in /usr/share/doc/ope=
ngl-1.1.0 to learn how to
> do that.
>
> The OpenGL implementation in that case is provided by Window's opengl32.d=
ll. Cygwin's w32api package
> provides the headers and link library for that version of OpenGL.
>
> LD_LIBRARY_PATH has no effect if you go that way.
>
> 2- Using X11, which provides an opengl implementation. At one point, ther=
e was support for hardware
> acceleration; then, it went away; I don't know if it came back or if it i=
s coming back "soon". I will let the maintainer of the libGL* packages answ=
er questions you may have about it. You would better send them to cygwin-xf=
ree at cygwin dot com .
>
>>
>> Thanks,
>>
>> David
>>
>
> - Andr=E9 Bleau, Cygwin's opengl package maintainer.

Hi Andr=E9,

I think I'm trying to build an X11 application - I'm trying to use a
library called VTK (http://www.vtk.org/). I don't believe it uses
glut, and I do see a bunch of X11 options in the CMake files. Even if
there is no support for hardware acceleration with this method, it
should still build, right?

I do have C:\Windows\System32\opengl32.dll . I should also have the
w32api package because I installed all of the cygwin packages.

Any other thoughts of things that would causes these linking errors?

Thanks for your help so far,

David

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