make error for Language::Prolog::Yaswi::Low

Hello, sigh...the erros seem like without end. Does it happen to you guys that debugging takes much much longer time than actual coding ?

Here I have problem of building Language::Prolog::Yaswi at http://search.cpan.org/~salva/Language-Prolog-Yaswi-0.14/Yaswi.pm
It's an XS module. Recently, before I upgrade from perl 5.8.8 to perl 5.10 I have not problem building this module. 

Not problem for Makefile.PL but problem for 'make'

william@william-pc:/tmp/Language-Prolog-Yaswi-0.14$ sudo /usr/local/bin/perl Makefile.PL 
retrieving SWI-Prolog configuration:
  running 'pl -dump-runtime-variables'
    PLBASE: /usr/local/lib/pl-5.6.55
    PLARCH: i686-linux
    PLLIBS: -lgmp -lrt -lreadline -lncurses -lm -lrt -ldl 
    PLLIB: -lpl
    PLCFLAGS: -pthread 
    PLLDFLAGS: -export-dynamic -O3 -pthread
    PLSOEXT: so
    PLVERSION: 50655
    PLSHARED: yes
    PLTHREADS: yes

checking thread support in Perl and SWI-Prolog:
  thread support enabled

creating plconfig.c
Writing Makefile for Language::Prolog::Yaswi::Low
Writing Makefile for Language::Prolog::Yaswi

-----------------------------------------------------------------------------------------------------

william@william-pc:/tmp/Language-Prolog-Yaswi-0.14$ sudo make
make[1]: Entering directory `/tmp/Language-Prolog-Yaswi-0.14/Low'
cc -c  -I. -I/usr/local/lib/pl-5.6.55/include -D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g -O0   -DVERSION=\"0.13\" -DXS_VERSION=\"0.13\" -fPIC "-I/usr/local/lib/perl5/5.10.0/i686-linux-thread-multi/CORE"   Low.c
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_END’:
Low.xs:50: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs:50: error: (Each undeclared identifier is reported only once
Low.xs:50: error: for each function it appears in.)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_start’:
Low.xs:68: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_cleanup’:
Low.xs:79: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_toplevel’:
Low.xs:91: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_swi2perl’:
Low.xs:103: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_openquery’:
Low.xs:120: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_cutquery’:
Low.xs:165: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_nextsolution’:
Low.xs:174: error: ‘my_cxt_index’ undeclared (first use in this function)
Low.xs: In function ‘XS_Language__Prolog__Yaswi__Low_testquery’:
Low.xs:205: error: ‘my_cxt_index’ undeclared (first use in this function)
make[1]: *** [Low.o] Error 1
make[1]: Leaving directory `/tmp/Language-Prolog-Yaswi-0.14/Low'
make: *** [subdirs] Error 2



Any idea why ? Thanks.


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