problems with make kernel

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Using a fresh copy of the src tree (from a private cvs repo which was 
updated right before the copy was made) I get the following on -CURRENT 
AMD64 make kernel:

===> dtrace/dtrace (all)
cc -O2 -pipe -march=nocona -DDIS_MEM -DSMP -DDEBUG -fno-strict-aliasing 
-Werror -D_KERNEL -DKLD_MODULE -std=c99 -nostdinc  
-I/usr/src/sys/modules/dtrace/dtrace/../../../cddl/compat/opensolaris 
-I/usr/src/sys/modules/dtrace/dtrace/../../../cddl/dev/dtrace 
-I/usr/src/sys/modules/dtrace/dtrace/../../../cddl/dev/dtrace/amd64 
-I/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common 
-I/usr/src/sys/modules/dtrace/dtrace/../../.. 
-DHAVE_KERNEL_OPTION_HEADERS -include 
/usr/obj/usr/src/sys/MONSTER/opt_global.h -I. -I_at_ -I_at_/contrib/altq 
-finline-limit=8000 --param inline-unit-growth=100 --param 
large-function-growth=1000 -fno-common  -fno-omit-frame-pointer 
-I/usr/obj/usr/src/sys/MONSTER -mcmodel=kernel -mno-red-zone  
-mfpmath=387 -mno-sse -mno-sse2 -mno-sse3 -mno-mmx -mno-3dnow  
-msoft-float -fno-asynchronous-unwind-tables -ffreestanding -Wall 
-Wredundant-decls -Wnested-externs -Wstrict-prototypes  
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef 
-Wno-pointer-sign -fformat-extensions -Wno-unknown-pragmas -c 
/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c: 
In function 'dtrace_dif_subr':
/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:3283: 
error: 'SX_UNLOCKED' undeclared (first use in this function)
/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:3283: 
error: (Each undeclared identifier is reported only once
/usr/src/sys/modules/dtrace/dtrace/../../../cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c:3283: 
error: for each function it appears in.)
*** Error code 1


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