Fltk toolkit: how to force *non*-anti-aliased operation

[h6mgos8bn6fb]

Hello! 

Octave version 4.0.3 (Debian Stretch; sorry, didn't check latest version). 

I do not want modern and beautiful anti-aliasing (AA). How to force all fltk 
graphics to be non-anti-aliased? 

For gnuplot everything is already non-anti-aliased, out of the box. Font name 
and size can be changed using:
set(0,'defaultaxesfontname','terminus'); 
set(0,'defaultaxesfontsize',12); 
set(0,'defaulttextfontname','terminus'); 
set(0,'defaulttextfontsize',12); 
plot(1:N); 
title(['wfevew']); 

But when I do it in fltk, I get garbage (tried several sizes, that do work for 
gnuplot): 
http://img12.lostpic.net/2018/02/10/f059025c75419074cb77ebe4cce4c6e7.png

Also, the blue plot line is AA-ed. 

Thanks.