error when "make depend"

[snnn]

Yesterday,I upgrade my FreeBSD to 6.0 from cdrom,then cvsup  the kernel 
source (/usr/src) to 6.0

when I recompile the kernel ,get the follow error

/usr/src/gnu/usr.bin/cc/cc_int/../../../../contrib/gcc/dojump.c:1101:23: 
gt-dojump.h: No such file or directory
mkdep: compile failed
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc/cc_int.
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc.
*** Error code 1

Stop in /usr/src/gnu/usr.bin.
*** Error code 1

Stop in /usr/src/gnu.
*** Error code 1

Stop in /usr/src.
*** Error code 1

-- 


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