libpg.so.2 is missing in 7.3.1

There is NO libpq.so.2 in 7.3.1 instead it has a libpg.so.3, however 7.3.0
do have libpq.so.2, no such a libpq.so.3.
This difference causes all my scripts fail with following err msg:

Can't load '/usr/local/lib/perl5/site_perl/5.005/i386-freebsd/auto/Pg/Pg.so'
for module Pg: Shared object "libpq.so.2" not found at
/usr/libdata/perl/5.00503/DynaLoader.pm line 169.

I copy libpq.so.2 from 7.3.0 in /usr/local/pgsql/lib of 7.3.1 then all my
scripts run OK. But I think that is very urly way to fix it.

Is there other way or I missed something.

Jie Liang