Error while compiling bro

The bro version i am using is bro-0.7a48 and platform is
OpenBSD park 2.8 GENERIC#399 i386

I am getting the following error while trying to compile bro:
Any pointers will be helpful.
setsignal.o: Undefined symbol `_sigset' referenced from text segment
collect2: ld returned 1 exit status

Does OpenBSD lack sigset()? If so, then you'll need to figure out why the
autoconf configure script is defining HAVE_SIGSET.