I typically have Xorg dev extension loaded when compiling fltk items.
Thanks, that's what it needed
edit: next problem. It seems to want a "man" script to put together documentation; I haven't found a way to disable.
edit: Built a copy (I had to compile it in puppy); indeed, looks like just about everything is already installed...but I have an idea now of all the files involved in the original package ( and docs might be handy when learning).