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From: Pieter de Goeje <pieter@degoeje.nl>
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Cc: Eric Mesa <ericsbinaryworld@gmail.com>
Subject: Re: problems building ftgl
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On Sunday 10 June 2007, Eric Mesa wrote:
> Whenever I try to build blender, it stops at ftgl, and I get:
>
> checking GL/gl.h usability... no
> checking GL/gl.h presence... no
> checking for GL/gl.h... no
> configure: error: GL/gl.h is needed
> exit: Illegal number: please
> exit: Illegal number: please
>
> *** Error code 1
>
> Stop in /usr/ports/graphics/ftgl.
> *** Error code 1
>
> Stop in /usr/ports/graphics/blender-devel
>
> This is a headless system, so I don't have any GUIs installed.  I'm
> just trying to install the minimum X needed for blender - so I may be
> missing something.   The whole xorg 7.2 build process was clear as mud
> for me.
>
> Thanks for any help you can provide.
Reading the error message above leads me to think you need to install 
graphics/libGL.

HTH,
Pieter de Goeje