problem building src RPM

hello

just downloaded the src RPM

I did
rpm -i postgresql-7.3-2PGDG.src.rpm
(from the download directory)
and then I changed to
/usr/src/redhat/SPECS

when I type
/usr/src/redhat/SPECS# ls -l
total 20
-rw-r--r-- 1 root root 19324 Dec 5 20:45 postgresql.spec

I can see that the postgresql.spec file is there

but when I type
/usr/src/redhat/SPECS# rpm -ba postgresql.spec
postgresql.spec: No such file or directory

you see the error.
I also tried
/usr/src/redhat/SPECS# rpm -ba ./postgresql.spec
./postgresql.spec: No such file or directory

but the file is there. I have never build postgresql form src RPM
before.

can anybody tell me what I have to do ??
thanks.

markus

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