2.5.46 make modules fail

[Roger While]

gcc -Wp,-MD,net/ipv4/netfilter/.ipt_TCPMSS.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=ipt_TCPMSS   -c -o 
net/ipv4/netfilter/ipt_TCPMSS.o net/ipv4/netfilter/ipt_TCPMSS.c
net/ipv4/netfilter/ipt_TCPMSS.c: In function `ipt_tcpmss_target':
net/ipv4/netfilter/ipt_TCPMSS.c:88: structure has no member named `pmtu'
net/ipv4/netfilter/ipt_TCPMSS.c:91: structure has no member named `pmtu'
net/ipv4/netfilter/ipt_TCPMSS.c:95: structure has no member named `pmtu'
make[3]: *** [net/ipv4/netfilter/ipt_TCPMSS.o] Error 1
make[2]: *** [net/ipv4/netfilter] Error 2
make[1]: *** [net/ipv4] Error 2
make: *** [net] Error 2