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.
This video is old; some things have changed since it was made:
The Makefile will need to be adjusted since this video was made
to include the new libs that VS and FLTK require. You can build
one of the FLTK test programs in the IDE and then look at the build log
to see what libs are needed.