problems installing pgsql

Hello everybody!
I'm so sorry to post this simple question but I don't know what to do, the
thing is I need to install postgresql 8.0.3 in red hat 9 but when I try to
do it this errors appear:
[root(at)bib root]# rpm -ivh postgresql-server-8.0.3-1PGDG.i686.rpm
warning: postgresql-server-8.0.3-1PGDG.i686.rpm: V3 DSA signature: NOKEY,
key ID 748f7d0e
error: Failed dependencies:
libcrypto.so.4 is needed by postgresql-server-8.0.3-1PGDG
libpq.so.4 is needed by postgresql-server-8.0.3-1PGDG
libssl.so.4 is needed by postgresql-server-8.0.3-1PGDG
postgresql = 8.0.3 is needed by postgresql-server-8.0.3-1PGDG
postgresql < 7.4 conflicts with postgresql-server-8.0.3-1PGDG
I've tried installing this packages:

postgresql72-libs-1-3.i386.rpm
postgresql-libs-7.1.3-5.72.i386.rpm

but I recieve similar errors, I mean dependency. for example:
[root(at)bib root]# rpm -ivh postgresql-libs-7.1.3-5.72.i386.rpm
Preparing... ########################################### [100%]
package postgresql-libs-7.2.3-5.80 (which is newer than
postgresql-libs-7.1.3-5.72) is already installed
file /usr/lib/libecpg.so.3 from install of
postgresql-libs-7.1.3-5.72conflicts with file from package
postgresql-libs-7.2.3-5.80
file /usr/lib/libpgeasy.so.2 from install of
postgresql-libs-7.1.3-5.72conflicts with file from package
postgresql-libs-7.2.3-5.80
file /usr/lib/libpq.so.2 from install of
postgresql-libs-7.1.3-5.72conflicts with file from package
postgresql-libs-7.2.3-5.80
file /usr/lib/libpq.so.2.0 from install of
postgresql-libs-7.1.3-5.72conflicts with file from package
postgresql-libs-7.2.3-5.80
and I also have tried to download the openssl package, 'cause i read
somewhere that's what i need, but i can't find the rpm package.
I'd really apreciate your help and thank you so much for your help!!