Currently I use SDL-1.2.7 and the latest FLTK-1.2 cvs.
CLAYTEK 3D DEPENDENCIES (If you don't have these, you need to download them to run ClayTek)
OpenGL - a cross-platform 3D graphics API
SDL - a cross-platform API providing access to graphics, audio, keyboard, mouse, and joystick
Fast Light Toolkit - a cross-platform C++ GUI toolkit that supports OpenGL (used by ClayTek 3D Editor)