label problem

[gareth]

Help:
I recently downloaded Octave-3.0.0 and its gnuplot for use with Mac OSX 
10.3.9.
Most things work just fine but I do have  a basic problem with axis 
labels, shown below for
both aqua and x11 setups.  Can you tell me what the problem and cure 
are, please?

Many thanks,
Gareth  Wlliiams
Princeton.

arrows ^^^ should line up with font f.


AQUA:

gar:8>> xlabel("XXX")

gnuplot> set xlabel "XXX" textcolor lt -1 font "helvetica,10";
                                                                      ^
                line 10101: unexpected or unrecognized option



X11:

gar:2>> xlabel("XXX")

gnuplot> set xlabel "{/helvetica XXX }" textcolor lt -1 font 
"helvetica,10";
                                                                        
                    ^
               line 10101: unexpected or unrecognized option