gre.* & FreeBSD 4.0

Does anyone apply gre.* from squid FAQ to FreeBSD 4.0? I can't,
because:

cc -c -O -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -fformat-extensions -ansi -nostdinc -I- -I. -I../.. -I/usr/include -D_KERNEL -include opt_global.h -elf -mpreferred-stack-boundary=2 ../../netinet/gre.c
../../netinet/gre.c: In function `gre_input':
../../netinet/gre.c:60: too few arguments to function `rip_input'
*** Error code 1

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