I've packaged the latest version of the Fast and Light Tool Kit (fltk) for VL 5.9 and VL 5.9.1. Please note that this package is names fltk2 to allow it to install side by side with fltk 1.x. This should prevent breaking any existing packages built on the older version.
Package Size: 629K
Installed Size: 3200K
fltk2: fltk2 (The Fast Light Tool Kit)
fltk2: FLTK (pronounced "fulltick") is a C++ graphical user
fltk2: interface toolkit for X (UNIX(r)), OpenGL(r), and Microsoft(r)
fltk2: Windows(r). It was originally developed by Bill Spitzak and
fltk2: maintained by a small group of developers across the world
fltk2: with a central repository in the US.
fltk2: License: FLTK LIBRARY LICENSE
fltk2: Authors: see CREDITS file
fltk2: Website: http://fltk.org/
After testing this package, please take a moment and come back to this thread to let us know how it works for you.