The configuration file is searched for
in the following places (in order):

by unixODBC:
- $ODBCINI
- ~/.odbc.ini
- /home/.odbc.ini ?? $HOME/.odbc.ini ??
- /etc/odbc.ini

by iodbc:
- ~/.odbc.ini
- $ODBCINI
- SYS_ODBC_INI/odbc.ini

Having set SYS_ODBC_INI to "/etc/odbc.ini",
one can make the save assumption, that the
search path is at least:
- ~/.odbc.ini
- /etc/odbc.ini

The $ODBCINI variable should be considered
to be for diagnostic purpose, only.

See the iodbc/README and iodbc/odbc.ini.sample
for syntax and an example.
