install failure of ports

[Tsurutani Naoki]

I can't install any ports today.
For example:

# cd /usr/ports/textproc/gsed
# make install
...
gmake[2]: Nothing to be done for `install-exec-am'.
gmake[2]: Nothing to be done for `install-data-am'.
gmake[2]: Leaving directory `/usr/local/work/usr/ports/textproc/gsed/work/sed-4.2.1'
gmake[1]: Leaving directory `/usr/local/work/usr/ports/textproc/gsed/work/sed-4.2.1'
make: don't know how to make add-plist-buildinfo. Stop
*** Error code 2

Stop in /usr/ports/textproc/gsed.
#

"add-plist-buildinfo" is found in Mk/bsd.port.mk, and seems to be added recently.

Is there any solution ?

My host:
h116[root] % uname -a
FreeBSD h116.65.226.10.32118.vlan.kuins.net 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #26: Sun 
Jan 23 18:42:22 JST 2011     turutani at h116.65.226.10.32118.vlan.kuins.net:/usr/local/work/usr/obj/usr/src/sys/POLYMER13  
amd64