Attach ng_nat and libalias to build.

sys/conf/NOTES

@@ -478,6 +478,9 @@ options 	NETSMBCRYPTO		#encrypted password support for SMB
 # mchain library. It can be either loaded as KLD or compiled into kernel
 options 	LIBMCHAIN
 
+# libalias library, performing NAT
+options		LIBALIAS
+
 # altq(9). Enable the base part of the hooks with the ALTQ option.
 # Individual disciplines must be built into the base system and can not be
 # loaded as modules at this point. In order to build a SMP kernel you must
@@ -532,6 +535,7 @@ options 	NETGRAPH_LMI
 #options 	NETGRAPH_MPPC_COMPRESSION
 options 	NETGRAPH_MPPC_ENCRYPTION
 options 	NETGRAPH_NETFLOW
+options		NETGRAPH_NAT
 options 	NETGRAPH_ONE2MANY
 options 	NETGRAPH_PPP
 options 	NETGRAPH_PPPOE

sys/modules/Makefile

@@ -125,6 +125,7 @@ SUBDIR=	${_3dfx} \
 	joy \
 	kue \
 	lge \
+	libalias \
 	libiconv \
 	libmbpool \
 	libmchain \

sys/modules/netgraph/Makefile

@@ -26,6 +26,7 @@ SUBDIR=	async \
 	l2tp \
 	lmi \
 	${_mppc} \
+	nat \
 	netflow \
 	netgraph \
 	one2many \