Which Linux ODBC Driver Versionfor 7.4.3?

I have installed the Whitebox version of Red Hat 3.0 ES with PostgreSQL
version 7.4.3. I am using a Linux application that uses an ODBC
connection on the Linux machine. There appear to be at least three
PostGreSQL ODBC drivers available in the /usr/lib directory:
psqlodbc.so, libodbcpsql.so.1, and libodbcpsql.so.2. When my
application connects to the driver, it queries the driver name and
version. With the psqlodbc.so, the name is PostgreSQL Legacy, and the
version is 07.03.0100. With libodbc.so.1 driver, the name is PostgreSQL
and the version is 6.40.0007. With libodbc.so.2, the name is PostgreSQL
and the version is 07.01.0003.

From a prior posting, it appears the the name PostgreSQL Legacy is used
for ODBC 2.5 drivers, and the new ODBC 3.0 drivers use the name
PostgreSQL. So it would appear that the libodbcpsql.so.2 is the latest
driver. Is this correct? If not, which is the current / latest stable
driver? Thanks.