build failure, netbsd.ldscript cannot be found...

[bch <brad.harder%gmail.com@localhost>]

#      link  GENERIC/netbsd
/usr/src/obj/tooldir.NetBSD-7.99.21-amd64/bin/x86_64--netbsd-ld -Map
netbsd.map --cref -T netbsd.ldscript -Ttext 0xffffffff80100000 -e
start -z max-page-size=0x100000 -X -o netbsd ${SYSTEM_OBJ}
${EXTRA_OBJ} vers.o
/usr/src/obj/tooldir.NetBSD-7.99.21-amd64/bin/x86_64--netbsd-ld:
cannot open linker script file netbsd.ldscript: No such file or
directory
*** [netbsd] Error code 1

nbmake: stopped in /usr/obj/sys/arch/amd64/compile/GENERIC
1 error

nbmake: stopped in /usr/obj/sys/arch/amd64/compile/GENERIC

ERROR: Failed to make all in "/usr/src/sys/arch/amd64/compile/obj/GENERIC"
*** BUILD ABORTED ***