GNU Prolog/logtalk

Hi all, 
   I have just started working in logtalk today. I am using it with GNU
Prolog. I want to make an executable for birds example. I am using the
following command to generate the executable. 

gplc *.pl ../../compiler/logtalk.pl ../../configs/gnu.pl


I get the following error:

[saurabh@emachine1 birds]$ gplc *.pl ../../compiler/logtalk.pl
../../configs/gnu.pl
/tmp/gplcUg8BDb.o(.text+0x1bb): In function `Lpred3_3':
: undefined reference to `predicate($proto_hierarchy0__dcl/5)'
/tmp/gplcUg8BDb.o(.text+0x2b9): In function `Lpred5_3':
: undefined reference to `predicate($proto_hierarchy0__def/5)'
collect2: ld returned 1 exit status
compilation failed

I dont even know if this is the right mailing list to ask this question.

All suggestions will be appreciated.

Regards,
Saurabh