Segmentation fault while using Sable

[Cherrot]

Hi, all
Recently I have built festival 2.1 on my Ubuntu 11.04.  Unfortunately, 
when I tried using Sable files to synthesize  speech, I encountered 
segmentation fault and the festival was forced to quit:
    festival> (tts_file "/opt/festival/festival/example.sable" 'sable)
    Segmentation fault.
    cherrot@cherrot-TA880G-HD:/opt/festival/festival$
I notice that I have not included 'rxp' in my config file in 
/festival/config/. However, when I tried to include 'rxp' by adding " 
ALSO_INCLUDE += rxp "  in my config file,  after execute "make test", 
the output seems that my compilation had been failed:  
http://pastebin.com/x64peuW9
The main part of the error I guess is:

  1.
     SIOD: duplicate builtin function: tts_file_xml
  2.
     SIOD: probably an error
  3.
     SIOD: duplicate builtin function: xml_register_id
  4.
     SIOD: probably an error
  5.
     SIOD: duplicate builtin function: xml_registered_ids
  6.
     SIOD: probably an error

How could I get Sable work on my Festival ?  Thank in advance.
Best regards,
    Cherrot
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