buildworld -DNOCLEAN problem with gperf/getopt.h

If I build with a populated obj directory, created after cleaning out
/usr/obj/ completely and then building on 7 March, I get this:

--------------------------------------------------------------
>>> stage 1.2: bootstrap tools
--------------------------------------------------------------
cd /usr/local/src; MAKEOBJDIRPREFIX=/usr/obj/usr/local/src/i386
DESTDIR=  INSTALL="sh /usr/local/src/tools/install.sh"
PATH=/usr/obj/usr/local/src/i386/legacy/usr/sbin:/usr/obj/usr/local/src/i386/legacy/usr/bin:/usr/obj/usr/local/src/i386/legacy/usr/games:/sbin:/bin:/usr/sbin:/usr/bin
 WORLDTMP=/usr/obj/usr/local/src/i386  MAKEFLAGS="-m
/usr/local/src/tools/build/mk  -D NOCLEAN -m /usr/local/src/share/mk"
make -f Makefile.inc1  BOOTSTRAPPING=502105  -DNOHTML -DNOINFO -DNOLINT
-DNOMAN -DNOPIC -DNOPROFILE  -DNOSHARED -DNO_CPU_CFLAGS -DNO_WARNS
bootstrap-tools
===> games/fortune/strfile
sh /usr/local/src/tools/install.sh -s -o root -g wheel -m 555   strfile
/usr/obj/usr/local/src/i386/legacy/usr/games
===> gnu/usr.bin/gperf
===> gnu/usr.bin/gperf/doc
===> gnu/usr.bin/gperf/doc
make: don't know how to make
/usr/obj/usr/local/src/i386/legacy/usr/include/getopt.h. Stop
*** Error code 2

If I cd into gnu/usr.bin/gperf/doc I can run `make cleandir && make obj
&& make depend && make all` with no problems, so I'm confused as to
what's wrong here.

Doug


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