compiling

HI,
I have a function declaration(prototype) in lock.h and its definition in
lock.c, earlier i could make a call to this function from
src/backend/postmaster/postmaster.c, but now it throws the following error
when i try to make it.:

Undefined first referenced
symbol in file
forDebugging postmaster/SUBSYS.o
FormLinkedList postmaster/SUBSYS.o

can someone help me with this.?
thanks
J

_________________________________________________________________
MSN 8 with e-mail virus protection service: 2 months FREE*
http://join.msn.com/?page=features/virus