Installation problem on MacOSX

Hello,
I try the procedure explained

Techdocs.posgresql.org/installguide.php

No problem to configure and make

But : make install give me this

All of PostgreSQL successfully made. Ready to install.
[localhost:sources/PostGresql/postgresql-7.1.1] root# make install
make -C doc install
mkdir /usr/local/pgsql
mkdir /usr/local/pgsql/man
mkdir /usr/local/pgsql/doc
mkdir /usr/local/pgsql/doc/html
gzip -d -c postgres.tar.gz | ( cd /usr/local/pgsql/doc/html && /usr/bin/tar
xf - )
tar: Unable to set file uid/gid of index.html <No such file or directory>
make[1]: *** [install] Error 1
make: *** [install] Error 2

What i have to do ?

PS: I'm a Mac Users . Unix is very new for me.
But On my PB TI PHP4 and MySql works fine.

Bernard van den Eynde