[Bro] A question about loading signature files

[zhiquan lai]

HI ALL,

I wrote a simple Bro policy file test.bro to load signatures in
snort-default.sig file by redef "signature_files".
However, when Bro loaded test.bro, many errors like
"smtp_servers(http_servers ...) didn't defined".

Should I define these variables in my test.bro file?
Or is there any common configure file to defined them?

Thanks in advance

Quan
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