Note that the bundled SQDR Oracle 8 driver is recommended in most situations, but the Oracle Instant Client can be also be used.
If this is a combined tier scenario (i.e. you have installed SQDR Plus and SQDR on the same system), then Oracle Instant client is present in the SQDR Plus installation.
add this stanza to /etc/odbcinst.ini
[OracleIC]
Driver=/opt/stelo/sqdrplus/OracleIC/libsqora.so.19.1
Setup=
FileUsage=
CPTimeout=
CPReuse=
a typical DSN looks like
[SRV01]
Driver=OracleIC
ServerName = SRV01
where SRV01 is an entry in tnsnames.ora.
Set the environment variable TNS_ADMIN to the directory containing tnsnames.ora.
It may be necessary to add the directory containing the OracleIC binaries to LD_LIBRARY_PATH.