installation of postgresql-7.2.3-2PGDG

I downloaded postgresql (client, server and libs) but cannot complete
installation for want of the libraries listed below

         libcrypto.so.2 is needed by postgresql-7.2.3-2PGDG
         libssl.so.2 is needed by postgresql-7.2.3-2PGDG
         libcrypto.so.2 is needed by postgresql-libs-7.2.3-2PGDG
         libssl.so.2 is needed by postgresql-libs-7.2.3-2PGDG
         libcrypto.so.2 is needed by postgresql-server-7.2.3-2PGDG
         libssl.so.2 is needed by postgresql-server-7.2.3-2PGDG

Could someone be gracious enough to let me know how I can get these
libraries and complete the installation?

The libraries in question are libcrypto.so.2 and libssl.so.2.

I shall be most thankfulfor your help!

ratnavale