Index: lib/libifconfig/Makefile
===================================================================
--- lib/libifconfig/Makefile
+++ lib/libifconfig/Makefile
@@ -4,6 +4,8 @@
 LIB=		ifconfig
 INTERNALLIB=	true
 
+LIBADD=		m
+
 SHLIBDIR?=	/lib
 SHLIB_MAJOR=	1
 SRCS=		libifconfig.c \
Index: rescue/rescue/Makefile
===================================================================
--- rescue/rescue/Makefile
+++ rescue/rescue/Makefile
@@ -222,11 +222,12 @@
 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
 CRUNCH_PROGS_usr.sbin+=	iscsid
Index: share/mk/src.libnames.mk
===================================================================
--- share/mk/src.libnames.mk
+++ share/mk/src.libnames.mk
@@ -380,6 +380,7 @@
 _DP_zfs_core=	nvpair
 _DP_zpool=	md pthread z nvpair avl umem
 _DP_be=		zfs nvpair
+_DP_ifconfig=	m
 
 # OFED support
 .if ${MK_OFED} != "no"