[MUMmer-help] Question about defined(%hash) is deprecated!

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Dear Adam Phillippy,
When I used mummerplot to draw graphic based on 
your example (H_pylori26695_Eslice.fasta, H_pyloriJ99_Eslice.fasta), I 
meet some confusing sentences. as follows:

lhl@tw2:~/Desktop/Mummer$ mummerplot -x "[0,275287]" -y "[0,265111]" -postscript -p mummer 1.mums
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 884.
    (Maybe you should just omit the defined()?)
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 894.
    (Maybe you should just omit the defined()?)
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 981.
    (Maybe you should just omit the defined()?)
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 991.
    (Maybe you should just omit the defined()?)
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 1034.
    (Maybe you should just omit the defined()?)
defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 1044.
    (Maybe you should just omit the defined()?)
gnuplot 4.4 patchlevel 3
Reading mummer file 1.mums (use mummer -c)
Writing plot files mummer.fplot, mummer.rplot
Writing gnuplot script mummer.gp
Rendering plot mummer.ps

I can get a plot, but could you tell me the explation of sentences about "defined(%hash) is deprecated at /home/lhl/Desktop/MUMmer3.23/mummerplot line 884, 894, 981, 991, 1034, and 1044. (Maybe you should just omit the defined()?)" ?  I wonder if it will influence the result. Thank you very much! 

Best regards,
Hailan 		 	   		  