2.5.46 make modules fail

[Roger While]

   gcc -Wp,-MD,net/bridge/.br_netfilter.o.d -D__KERNEL__ -Iinclude -Wall 
-Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer 
-fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 
-march=i686 -Iarch/i386/mach-generic -nostdinc -iwithprefix include 
-DMODULE   -DKBUILD_BASENAME=br_netfilter   -c -o net/bridge/br_netfilter.o 
net/bridge/br_netfilter.c
net/bridge/br_netfilter.c:60: unknown field `pmtu' specified in initializer
net/bridge/br_netfilter.c: In function `br_nf_pre_routing_finish':
net/bridge/br_netfilter.c:162: warning: implicit declaration of function 
`ip_route_output'
make[2]: *** [net/bridge/br_netfilter.o] Error 1
make[1]: *** [net/bridge] Error 2
make: *** [net] Error 2