webmin build fail

[Water NB <netbsd78%126.com@localhost>]

Testing Perl ...
Perl seems to be installed ok

***********************************************************************
sw_vers: not found
sw_vers: not found
sw_vers: not found
sw_vers: not found
sw_vers: not found
Automatic OS detection failed/usr/bin/sed       -e "/^env_WEBMIN_CONFIG=/s,/usr/
pkg/share/examples/webmin,/usr/pkg/etc/webmin,"  -e "/^logout=/s,/usr/pkg/share/
examples/webmin,/usr/pkg/etc/webmin,"    -e "/^userfile=/s,/usr/pkg/share/exampl
es/webmin,/usr/pkg/etc/webmin,"  -e "/^keyfile=/s,/usr/pkg/share/examples/webmin
,/usr/pkg/etc/webmin,"   /usr/pkg/share/examples/webmin/miniserv.conf > /tmp/pkg
src-obj/sysutils/webmin/work/miniserv.conf
sed: /usr/pkg/share/examples/webmin/miniserv.conf: No such file or
directory
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/sysutils/webmin
*** Error code 1