Problems installing PostgreSQL-7.3.3 RPM

I have downloaded the set of postgresql-7.3.3-1PGDG RPM packages and
tried to install it on  RedHat 8.0. On this server there was no other
PostgreSQL installation. After submitting  the command  below:

# rpm -ivh postgresql-7.3.3-1PGDG.i386.rpm

I received the following error message:

error: Failed dependencies:
         libpq.so.3 is needed by postgresql-7.3.3-1PGDG

I looked up in the www.postgresql.org and didn't find any documentation
related to 7.3.3 RPM installation procedure or about the problem
previously related.

Does anyone have any clue about how to fix this?

Thanks in advance.

Valeria Castro.