My build isn't happy.

--- uvm_map.o ---
#   compile  GENERIC/uvm_map.o
/u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/vax--netbsdelf-gcc -mno-asm-pic -ffreestanding -O2 -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes -Wno-sign-compare -Wno-uninitialized -D_VAX_INLINE_ -I. -I/u0/work/netbsd-current/src/sys/arch -I/u0/work/netbsd-current/src/sys -nostdinc -DLKM -DMAXUSERS=8 -D_KERNEL -D_KERNEL_OPT -c /u0/work/netbsd-current/src/sys/uvm/uvm_map.c
--- uvm_map.o ---
/u0/work/netbsd-current/src/sys/uvm/uvm_map.c:3881: field `ukh_entries' has incomplete type
--- uvm_map.o ---
*** [uvm_map.o] Error code 1
1 error

nbmake: stopped in /u0/work/netbsd-current/src/sys/arch/vax/compile/obj/GENERIC

*** Failed target:  kern-GENERIC
*** Failed command: cd /u0/work/netbsd-current/src/sys/arch/vax/compile/obj/GENERIC && /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake depend && /u0/work/netbsd-current/src/obj/tooldir.NetBSD-1.6ZG-i386/bin/nbmake
*** Error code 2

Stop.
nbmake: stopped in /u0/work/netbsd-current/src/etc
*** [release] Error code 1
1 error

nbmake: stopped in /u0/work/netbsd-current/src

ERROR: Failed to make release
*** BUILD ABORTED ***