c compile error on implicit declaration

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Hi all

I am trying to compile the c code and got the following error.

cc -DIWORDSIZE=4 -DMAX_HISTORY=25 -DNMM_CORE=0  -c -g  registry.c
registry.c:60:3: warning: implicit declaration of function 'sym_forget' is invalid in C99 [-Wimplicit-function-declaration]
  sym_forget() ;
  ^

Do anybody have any ideas on it?

Thank you
Bruce

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