diff --git a/lib/libbsnmp/libbsnmp/Makefile b/lib/libbsnmp/libbsnmp/Makefile
index a944e28722cf..a261847361e6 100644
--- a/lib/libbsnmp/libbsnmp/Makefile
+++ b/lib/libbsnmp/libbsnmp/Makefile
@@ -8,9 +8,9 @@ CONTRIB= ${.CURDIR}/../../../contrib/bsnmp/lib
 LIB	= bsnmp
 SHLIBDIR ?= /lib
 
-CFLAGS+= -I${CONTRIB}
+CFLAGS+= -I${CONTRIB} -DHAVE_ERR_H -DHAVE_GETADDRINFO -DHAVE_STRLCPY
 
-SRCS=	asn1.c snmp.c snmpagent.c snmpclient.c
+SRCS=	asn1.c snmp.c snmpagent.c snmpclient.c support.c
 INCS=	asn1.h snmp.h snmpagent.h snmpclient.h
 MAN=	asn1.3 bsnmplib.3 bsnmpclient.3 bsnmpagent.3