how to install postgresql!!

now I have install postgreSQL7.2.tar.gz,but can't run it
my step:
1  # ./confugure
2  # make
3  # make install (prompt succed!!)
4  #LD_LIBRARY_PATH=/usr/local/pgsql/lib
   # export LD_LIBRARY_PATH
   #/sbin/ldconfig /usr/local/pgsql/lib
   # MANPATH=/usr/local/pgsql/man:$MANPATH
    (above command according to the INSTALL file of postgresql7.2   all no problem)
5  #adduser postgres
6  #mkdir /usr/local/pgsql/data
   #chown postgres /usr/local/pgsql/data
   #su - postgres
7  $ /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
   prompt:success, you can now start the database server using:
   /usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data
8  $/usr/local/pgsql/bin/postmaster -D /usr/local/pgsql/data
   error:FATAL 1:Can't read lock file /tmp/.s.PGSQL.5432.lock:Permission denied
   why?????????
   can you help me? I can't input chinese in linux
   please answer in chinese
   3x!!

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