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.

thanks a lot

make

c++ -o bro main.o net_util.o parse.o scan.o re-parse.o re-scan.o util.o Attr.o BackDoor.o BroString.o CCL.o CompHash.o Conn.o DFA.o Desc.o Dict.o Discard.o DNS.o EquivClass.o Event.o Expr.o File.o Finger.o Frag.o Frame.o FTP.o Func.o Hash.o HTTP.o ICMP.o ID.o Ident.o InterConn.o List.o Logger.o Login.o NFA.o NVT.o Net.o NetVar.o Obj.o OtherTCP.o PktSrc.o Portmap.o PriorityQueue.o Queue.o Reassem.o Rlogin.o RE.o RPC.o Scope.o Sessions.o SteppingStone.o Stmt.o TCP.o Telnet.o Timer.o Type.o UDP.o Val.o Var.o XDR.o cq.o nb_dns.o setsignal.o version.o -Lbind8/lib -lbind ../libpcap-0.4/libpcap.a -lm
setsignal.o: Undefined symbol `_sigset' referenced from text segment
collect2: ld returned 1 exit status
*** Error code 1