--- a/src/usr.sbin/config/Makefile
+++ b/src/usr.sbin/config/Makefile
@@ -16,6 +16,8 @@
 DPADD=	${LIBL} ${LIBSBUF}
 LDADD=	-ll -lsbuf
 
+LDADD+=	-lbsd
+
 CLEANFILES+=	kernconf.c
 
 mkmakefile.o: configvers.h