fltk does not work on cygwin version octave-6.4.0

[Takashi Yano]

On Tue, 21 Jun 2022 14:15:12 +0900 (JST)
Tatsuro MATSUOKA wrote:
> fltk does not work on cygwin version octave-6.4.0
> 
> octave:1> graphics_toolkit fltk
> octave:2> plot(1:10);
> Insufficient GL support
> error: unable to plot due to insufficient OpenGL support
> 
> plot windows flashes and disappear immediately

I guess it depends on GPU. What GPU do you use?
It almost works in my environment except for that it needs
'Reset Figure' to draw. Without 'Reset figure', the plot area
is filled gray. My GPU is GeForce GTX 750 Ti.

Did you try LIBGL_ALWAYS_SOFTWARE=1 ?

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>