Re: support for offscreen rendering with OSMesa was unavailable

[Francesco Potortì]

>> error: __osmesa_print__: support for offscreen rendering with OSMesa was
>> unavailable or disabled when Octave was built
>> error: called from
>>     __opengl_print__ at line 161 column 7
>>     print at line 561 column 14
>> 
>> This is Octave 4.4.0 on Debian testing

>It looks like the debian Octave package does not include OSMesa, which is
>not very surprising since OSMesa does not play very well (at all?) with the
>future architecture of OpenGL on linux (libglvnd). Note also that direct
>support of OSMesa for offscreen printing has recently been removed from
>Octave sources (future Octave 5) and will probably be provided by an
>external Octave Forge package in the future.
>
>In any event, my guess is that the debian package includes the Qt toolkit
>which in turn is supposed to support offscreen rendering without the use of
>OSMesa. Why not switch to the Qt toolkit?

Ok, I'm filing a bug report in favour of adding an error message when
trying to print offscreen with fltk.

>TODO: This page has not been updated : http://wiki.octave.org/OSMesa 

For those who will update the wiki: gnuplot works offscreen.  I haven't
tried qt.

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