[1] https://www.fltk.org/doc-1.4/ (HTML) https://www.fltk.org/doc-1.4/fltk.pdf (PDF) [2] https://github.com/fltk/fltk.git [3] https://github.com/fltk/fltk/releases/ [4] https://www.fltk.org/software.php [5] https://raw.githubusercontent.com/fltk/fltk/refs/tags/release-1.4.3/CHANGES.txt