"errors" when running plot

[ws]

Hi Octavians,
 
I am using a hand-compiled Gnuplot (4.2.5) and Octave (3.2.0 -- yay!) both with
"without-x" set from configure, running in my home directory.  I can plot (note
that "grrfoo.png" below is produced just fine), but I get weird messages from
octave:

octave:1> putenv('GNUTERM', 'png')  
octave:2> gnuplot_binary ('/home/wsprague/gnuplot-4.2.5/bin/gnuplot')
octave:3> putenv('DISPLAY', '')  # this used to silence the X11 warning
octave:4> plot(1:10)
warning: X11 DISPLAY environment variable not set
error: get: unknown property "__pixels_per_inch__"
error: called from:
error:   /home/wsprague/octave-3.2.0/share/octave/3.2.0/m/plot/gnuplot_drawnow.m
at line 176, column 14
error:   /home/wsprague/octave-3.2.0/share/octave/3.2.0/m/plot/gnuplot_drawnow.m
at line 87, column 14
octave:5> print ~/grrfoo.png

Can someone help me make them go away? Thanks!