When connecting with a CASLIB statement to an ODBC data source and using unixODBC 2.3.1, you receive this error:
ERROR: The connection to the data source driver failed.
ERROR: ERROR: [unixODBC][Driver Manager]Data source name not found, and no default driver specified
ERROR: Function failed.
ERROR: The action stopped due to errors.
This error is resolved by installing a newer unixODBC version such as version 2.3.7 or later.