GetPrivateProfileString

I am investigating an issue where GetPrivateProfileString symbol
exists in Postgres ODBC driver code and in the Informix IDS driver
code.
I have an issue where code that expects to invoke
GetPrivateProfileString from psqlodbc.so is diving into libthcli.so
instead which is part of the Informix driver code?
This is probably an issue with ld.so and how the shared objects are
loaded into memory....would like to know if anyone has seen this
issue? I think the driver could
benefit from better function notation that will ensure unique
signatures for the Postgres ODBC API and the same goes for Informix
IDS.

Thanks.