fltk graphics

[Victor Hanby]

I'd like to try the fltk toolkit but get the following error

octave:5> graphics_toolkit("fltk")
error: feval: function `__init_fltk__' not found
error: called from:
error:   /opt/local/share/octave/3.6.3/m/plot/graphics_toolkit.m at  
line 59, column 5

other info:
octave:1> available_graphics_toolkits()
ans =
{
  [1,1] = fltk
  [1,2] = gnuplot
}
octave:2> loaded_graphics_toolkits()
ans = {}(1x0)

I'm using 3.6.3 from Macports on macOS 10.8.3

Vic

Professor V I Hanby
Institute of Energy and Sustainable Development
De Montfort University
Leicester LE1 9BH, UK
0116 257 7980