Broken makefile for docs

golem$ cd doc
golem$ make install
make all
make[1]: Entering directory `/opt/postgres/pgsql/doc'
rm -rf ./admin unpacked/admin
if test ! -d unpacked/admin ; then mkdir unpacked/admin ; fi
mkdir: cannot make directory `unpacked/admin': No such file or directory
make[1]: *** [admin] Error 1
make[1]: Leaving directory `/opt/postgres/pgsql/doc'
make: *** [install] Error 2

What is "unpacked"? And why does the docs Makefile want it??

                     - Tom