It looks like this is an extern variable that was declared in update.c
To reproduce,
./configure --with-python
make
pyextend.o: In function `pyextend_security_info':
/home/david/Code/honeyd/pyextend.c:535: undefined reference to `security_update'
collect2: ld returned 1 exit status
make[2]: *** [honeyd] Error 1
It looks like this is an extern variable that was declared in update.c
To reproduce,