Copyright (C) 2018 The fltkal authors
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License"
fltkal is a DOS fork of the Fast Light Toolkit (FLTK) using Allegro4 and DJGPP. The fork required renaming files to 8.3 conventions. Other than that, however, the API is compatible with the 1.4.x branch.
API Documentation can be found on the FLTK web site
http://fltk.org/doc-1.4/
Header file mappings can be found here
https://github.com/markjolesen/fltkal/blob/master/doc/build.md
A demo of a couple of example apps running on FreeDOS can be found here
FLTK port of DOS using Nano-X FLTK for DOS
https://sourceforge.net/projects/fltk-dos/
A cross platform C++ TUI inspired by FLTK FDOSTUI
http://www.nongnu.org/fdostui/