kern/46740: IPv4 only kernel with IPF does not compile

[martin%NetBSD.org@localhost]

>Number:         46740
>Category:       kern
>Synopsis:       IPv4 only kernel with IPF does not compile
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 24 10:25:00 +0000 2012
>Originator:     Martin Husemann
>Release:        NetBSD 6.99.9
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD beasty.aprisoft.de 6.99.9 NetBSD 6.99.9 (NIGHT-OWL) #103: Sun 
Jul 15 13:43:35 CEST 2012 
martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL
 amd64
Architecture: x86_64
Machine: amd64
>Description:

Trying to build an amd64 kernel with IPF but no INET6 fails:

cc1: warnings being treated as errors
../../../../external/bsd/ipf/netinet/ip_nat.c: In function 'ipf_nat_delrule':
../../../../external/bsd/ipf/netinet/ip_nat.c:2535:5: error: implicit 
declaration of function 'ipf_nat6_delrdr'
../../../../external/bsd/ipf/netinet/ip_nat.c:2546:5: error: implicit 
declaration of function 'ipf_nat6_delmap'
../../../../external/bsd/ipf/netinet/ip_nat.c: In function 'ipf_nat_rehash':
../../../../external/bsd/ipf/netinet/ip_nat.c:7972:26: error: 'natstat_t' has 
no member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7973:3: error: 'natstat_t' has no 
member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7976:22: error: 'natstat_t' has 
no member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7978:26: error: 'natstat_t' has 
no member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7979:3: error: 'natstat_t' has no 
member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7982:22: error: 'natstat_t' has 
no member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7993:22: error: 'natstat_t' has 
no member named 'ns_side6'
../../../../external/bsd/ipf/netinet/ip_nat.c:7994:22: error: 'natstat_t' has 
no member named 'ns_side6'
*** Error code 1


>How-To-Repeat:
s/a
>Fix:
n/a