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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