Octave 4.2.1 gui won't launch on OS X El Capitan 10.11

[swope]

Hi, I'm looking for help installing Octave 4.2.1 in OS X El Capitan (10.11)
using Homebrew. I used `brew install octave` without flags.

When I try to run Octave I see some _Welcome to Octave!_ popups, then a very
vague `octave exited with signal 11` and no command window.

On the bright side, running `octave --no-gui` works, and `sombrero` pops
open a figure. However, there is a warning: `warning: opengl_renderer: Error
1286 occurred in init_gl_context`

I have XQuartz 2.7.11 (xorg-server 1.18.4), gnuplot 5.0.6, and qt 5.9.0.

Any ideas for what I should be looking at next?

Thanks.




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