Can't build world: undefined reference to `_nsyylex'

When trying to build world using sources from moments ago, I end up
erroring:

===> bin/date
cc -O -pipe -mcpu=pentiumpro    -c /usr/src/bin/date/date.c
cc -O -pipe -mcpu=pentiumpro    -c /usr/src/bin/date/netdate.c
cc -O -pipe -mcpu=pentiumpro    -c /usr/src/bin/date/vary.c
cc -O -pipe -mcpu=pentiumpro     -static -o date date.o netdate.o vary.o -lutil
/usr/obj/usr/src/i386/usr/lib/libc.a(nsdispatch.o): In function `_nsdbtget':
nsdispatch.o(.text+0x32b): undefined reference to `_nsyyin'
nsdispatch.o(.text+0x33e): undefined reference to `_nsyyin'
/usr/obj/usr/src/i386/usr/lib/libc.a(nsparser.o)(.text+0xe): undefined reference to `_nsyylineno'
/usr/obj/usr/src/i386/usr/lib/libc.a(nsparser.o)(.text+0x13): undefined reference to `_nsyytext'
/usr/obj/usr/src/i386/usr/lib/libc.a(nsparser.o): In function `_nsyyparse':
nsparser.o(.text+0x26a): undefined reference to `_nsyylex'
nsparser.o(.text+0x381): undefined reference to `_nsyyerror'
nsparser.o(.text+0x5da): undefined reference to `_nsyylex'
nsparser.o(.text+0x684): undefined reference to `_nsyyerror'
*** Error code 1
Stop in /usr/src/bin/date.

I can't seem to track down where the problem is. Anybody else seeing this?

-- 
Sean Kelly         | PGP KeyID: D2E5E296
smkelly_at_zombie.org | http://www.zombie.org