Re: support for offscreen rendering with OSMesa was unavailable

[Francesco Potortì]

>> Ok, I'm filing a bug report in favour of adding an error message when
>> trying to print offscreen with fltk.
>
>The message you see is perfectly clear to me: the Octave binary you are
>using does not support OSMesa features. What would you expect?

Current:

error: __osmesa_print__: support for offscreen rendering with OSMesa was 
unavailable or disabled when Octave was built

Expected:

error: no fltk support for offscreen printing, use the gnuplot
       or qt graphic toolkits (see graphic_toolkit function)

Or something like that

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