At the time this video was made in 2004, Flash (.swf) was how videos were provided on the web.
Flash has since become almost obsolete. So the above video is now provided as a WEBM.
The original Flash video can still be found here.
Although old, this video is very relevant to the current versions of FLTK.
Some things have changed since it was made:
The Makefile will need to be adjusted since this video was made.
The compiler libs are a bit different now. To keep current, you
can just build one of the FLTK test programs in the IDE, and look at
the build log to see what libs are needed in your Makefile.
Or, if you use unix, you can use the new 'fltk-config' script
to compile FLTK applications, which handles including the appropriate libs for you.
Fluid now has its own 'build output' window to show errors from the compiler.
You may need to add '2>&1' to your build commands so that both stdout and stderr
appear in fluid's build output window.