I should have read through the whole document, further clarification:

 B: Instalation from the source:
    ----------------------------

    Make sure that you have the devel packages for the graphic system
    installed (the headers for X11 etc.)

    You need openGL on your system. Check your file system for the
    two following libraries:

    The openGL-library:              libGL.so  or  libMesaGL.so
    The higher level openGL-library: libGLU.so  or  libMesaGLU.so

    The libGLU should be the one from SGI. Otherwise the nurbs rendering
    is not supported.


Mark Brethen
mark.bret...@gmail.com



> On Jul 19, 2022, at 5:18 PM, Mark Brethen <mark.bret...@gmail.com> wrote:
> 
> This is from the install notes for CalculiX:
> 
>     The libGLU should be the one from SGI. Otherwise the nurbs rendering is
>     not supported.
> mesa’s API is very similar to that of OpenGL however it doesn't claim to be a 
> compatible replacement for OpenGL. So I’m not sure if that’s what I should 
> build with. 
> 
> I’m also confused about the two x11 window environments (xorg-server vs 
> xquartz). I’m assuming Xquartz libraries, etc are in /opt/local, what about 
> xorg?
> 
> Thanks,
> Mark
> 
> 
>> On Jul 2, 2022, at 12:00 AM, Ryan Schmidt <ryandes...@macports.org 
>> <mailto:ryandes...@macports.org>> wrote:
>> 
>> On Jun 30, 2022, at 07:50, Mark Brethen wrote:
>>> 
>>> I noticed that -framework OpenGL exists in /System/Library/Frameworks. Is 
>>> there an OpenGL framework port that I should be using?
>> 
>> The MacPorts equivalent of the OpenGL framework is the mesa port.
>> 
> 

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