# Compile error
**URL:** https://community.zeek.org/t/compile-error/171
**Category:** Zeek
**Created:** [July 9, 2001, 6:30am UTC](https://community.zeek.org/t/compile-error/171 "2001-07-09T06:30:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Vern](https://community.zeek.org/u/Vern)
#### Post date: [July 9, 2001, 6:30am UTC](https://community.zeek.org/t/compile-error/171/1 "2001-07-09T06:30:07Z")
> c++ -I. -O -I../libpcap-0.4 -Ilinux-include -c Func.cc
> Func.cc: In function `void do\_fmt (const char \*&, Val \*, ODesc \*)':
> Func.cc:244: `localtime' undeclared (first use this function)
> Func.cc:244: (Each undeclared identifier is reported only once for each
> function it appears in.)
> Func.cc:244: `strftime' undeclared (first use this function)
Try adding an include of \ at the beginning of Func.cc and see
if that resolves the problem.
Vern
---
### Author:  [@Ashley\_Thomas1](https://community.zeek.org/u/Ashley_Thomas1)
#### Post date: [July 12, 2001, 9:59pm UTC](https://community.zeek.org/t/compile-error/171/2 "2001-07-12T21:59:33Z")
Hi,
Lot of OS probes works by sending a combination of flags like
SFU12, SF12 etc and seeing how the OS behaves. I was wondering how to detect
these kind of probes using bro .
I know it can be done easily in the TCPConnection::NextPacket()
where you have the syn,fin,rst and other flags in separate variables.
Probably i could look for those pattern call the Weird().
But is that the way to go about it ? Or should the detection be done
at the bro-script level.
thanks
Ashley
---
### Author:  [@system](https://community.zeek.org/u/system)
#### Post date: [May 6, 2022, 3:36pm UTC](https://community.zeek.org/t/compile-error/171/3 "2022-05-06T15:36:21Z")