5.2 kernel compilation error

[paul]

after i fresh 5.2 install i cvsup using the tag releng_5_2 do a make 
world i then tryed doing a custom kernel and recieve the following error 
i also tryed make buildkernel make kernel and recieve the same error

sh ../../../conf/newvers.sh GENERIC
cc -c -O -pipe -mcpu=pentiumpro -Wall -Wredundant-decls -Wnested-externs 
-Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline 
-Wcast-qual  -fformat-extensions -std=c99  -nostdinc -I-  -I. -I../../.. 
-I../../../contrib/dev/acpica -I../../../contrib/ipfilter 
-I../../../contrib/dev/ath -I../../../contrib/dev/ath/freebsd 
-I../../../contrib/ngatm -D_KERNEL -include opt_global.h -fno-common 
-finline-limit=15000 -fno-strict-aliasing  -mno-align-long-strings 
-mpreferred-stack-boundary=2 -ffreestanding -Werror  vers.c
vers.c:30:18: unknown escape sequence '\.'
*** Error code 1

any help would be appreciated
regards -Paul