compile signal code

[Brian Henning]

Greetings:

I am having trouble compiling some signal related code in freebsd. What is the
library I should link to get this to compile?

Thanks,

Brian

/usr/local/src > gcc signal_handler.c
/tmp/ccfXkcCV.o: In function `main':
/tmp/ccfXkcCV.o(.text+0x11): undefined reference to `sigset'
/tmp/ccfXkcCV.o(.text+0x23): undefined reference to `sigset'
/tmp/ccfXkcCV.o: In function `sigusr':
/tmp/ccfXkcCV.o(.text+0x9d): undefined reference to `err_dump'