octave-devel @ 3.6.3 -- can't use fltk toolkit

[cdemills@…]

Hello,
myself and Ben Abbott tried to use the fltk toolkit. From inside octave:

available_graphics_toolkits 
ans = 
{ 
  [1,1] = fltk 
  [1,2] = gnuplot 
} 
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 
which "__init_gnuplot__" 
`__init_gnuplot__' is a function from the file /opt/local/lib/octave/3.6.3/oct/x86_64-apple-darwin12.2.0/__init_gnuplot__.oct
 which "__init_fltk__" 
=> no reply

The dir /opt/local/lib/octave/3.6.3/oct/x86_64-apple-darwin12.2.0 contains both __init_gnuplot.oct and __init_fltk.oct as required:

file __init_gnuplot__.oct 
__init_gnuplot__.oct: Mach-O 64-bit bundle x86_64 
file __init_fltk__.oct         
__init_fltk__.oct: Mach-O 64-bit bundle x86_64 

I installed octave-devel straight from the macport.

Regards

Pascal