The H/config.h has a HAVE_FLTK flag but the code uses USE_FLTK.  Is
H/config.h not used anymore?  If so can it be removed to simplify
things?

I am looking at the Macintosh at present, and despite having FLTK on
the machine it is not setting USE_FLTK, and not defining the opcodes.

==John ffitch