Postgresql8.4 install breaks Evolution on Ubuntu 9.10

Hi all,
I'm wondering if someone here know how to go about fixing this problem that
apparently affects everyone who manually install Postgresql8.4 on Ubuntu
Karmic(9.10).

Postgres installation seems to mess with something that renders other
applications unable to function. For instance my problem is with Evolution
Mail. This is the output I started getting after installing postgres:

evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by evolution)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/evolution/2.28/libemiscwidgets.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libgdata-1.2.so.1)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libgdata-1.2.so.1)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/evolution/2.28/libetable.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/evolution/2.28/libeutil.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/evolution/2.28/libeutil.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libebook-1.2.so.9)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libedataserver-1.2.so.11)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libsoup-2.4.so.1)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libgnomevfs-2.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libgnomevfs-2.so.0)
evolution: /opt/PostgreSQL/8.4/lib/libxml2.so.2: no version information
available (required by /usr/lib/libgnomevfs-2.so.0)
evolution: relocation error: /usr/lib/evolution/2.28/libeutil.so.0: symbol
xmlFirstElementChild, version LIBXML2_2.7.3 not defined in file libxml2.so.2
with link time reference

I can't be sure(no logs) but VMWare Workstation seems to have been affected
here too, can't get it to work anymore.

Other people having the same problem:
http://ubuntuforums.org/showthread.php?t=1307864
https://bugs.launchpad.net/ubuntu/+bug/461105

Best regards,
Leonardo C.