Index: head/lib/libifconfig/Makefile
===================================================================
--- head/lib/libifconfig/Makefile
+++ head/lib/libifconfig/Makefile
@@ -4,6 +4,8 @@
 LIB=		ifconfig
 INTERNALLIB=	true
 
+LIBADD=		m
+
 SHLIBDIR?=	/lib
 SHLIB_MAJOR=	1
 SRCS=		libifconfig.c \
Index: head/rescue/rescue/Makefile
===================================================================
--- head/rescue/rescue/Makefile
+++ head/rescue/rescue/Makefile
@@ -222,10 +222,11 @@
 CRUNCH_PROGS_usr.sbin+= chown
 CRUNCH_ALIAS_chown= chgrp
 ##################################################################
-CRUNCH_LIBS+= -lm
 
 CRUNCH_LIBS+=		${OBJTOP}/lib/libifconfig/libifconfig.a
 CRUNCH_BUILDOPTS+=	CRUNCH_CFLAGS+=-I${OBJTOP}/lib/libifconfig
+
+CRUNCH_LIBS+= -lm
 
 .if ${MK_ISCSI} != "no"
 CRUNCH_PROGS_usr.bin+=	iscsictl
Index: head/share/mk/src.libnames.mk
===================================================================
--- head/share/mk/src.libnames.mk
+++ head/share/mk/src.libnames.mk
@@ -390,6 +390,7 @@
 _DP_zutil=	avl tpool
 _DP_be=		zfs spl nvpair
 _DP_netmap=
+_DP_ifconfig=	m
 
 # OFED support
 .if ${MK_OFED} != "no"