Hello!  Sorry for dropping the ball on this.

Tim Gesthuizen <tim.gesthuizen@yahoo.de> writes:

> Hi,
> I tried to find some free time to investigate a little bit further in
> what exactly triggers the crash to happen.
> A few days ago I had the idea of getting a GL context through GLUT and
> don't use SDL at all. So I quickly investigated whether this would also
> crash.
> So I fetched the cube example (cube.c) from the OpenGL example archive:
>
> https://www.opengl.org/archives/resources/code/samples/glut_examples/examples/examples.html
>
> and compiled it through guix. You can find the exact procedure by
> inspecting the log attached. If I did not make an error this should
> proof that the problem lies in OpenGL and not in SDL.
>
> Tim.
> tibbe@tibbe-pc:~/src/glut-example$ guix environment --ad-hoc freeglut
> tibbe@tibbe-pc:~/src/glut-example$ echo $GUIX_ENVIRONMENT
> /gnu/store/gsfq0h6hpjz9ddvgn4g3gkl5r6gg3ink-profile
> tibbe@tibbe-pc:~/src/glut-example$ ls $GUIX_ENVIRONMENT
> etc  include  lib  manifest  share
> tibbe@tibbe-pc:~/src/glut-example$ gcc cube.c -L $GUIX_ENVIRONMENT/lib -l glut -l GL -I $GUIX_ENVIRONMENT/include
> /tmp/ccXMXGNS.o: In function `init':
> cube.c:(.text+0x321): undefined reference to `gluPerspective'
> cube.c:(.text+0x372): undefined reference to `gluLookAt'
> collect2: error: ld returned 1 exit status
> tibbe@tibbe-pc:~/src/glut-example$ gcc cube.c -L $GUIX_ENVIRONMENT/lib -l glut -l glu -l GL -I $GUIX_ENVIRONMENT/include
> ld: cannot find -lglu
> collect2: error: ld returned 1 exit status
> tibbe@tibbe-pc:~/src/glut-example$ gcc cube.c -L $GUIX_ENVIRONMENT/lib -l glut -l GLU -l GL -I $GUIX_ENVIRONMENT/include
> tibbe@tibbe-pc:~/src/glut-example$ ls
> a.out  cube.c
> tibbe@tibbe-pc:~/src/glut-example$ ./a.out 
> Segmentation fault

Nice catch!  Earlier in the bisect, you found
5318b103ff277efbac248a066d162589a9083baa (gnu: libepoxy: Update to
1.5.1.).  Can you try this patch and see if it makes a difference?