Did you build Perl DBD::ODBC with unixODBC? If so, you should ensure unixODBC is built without threads (use the configure option --enable-threads=no
).
The unixODBC Driver Manager that comes pre-built with the standard Easysoft ODBC-ODBC Bridge is built without threads being enabled. ODBC-ODBC Bridge distributions containing "mt" in the distribution name are thread-safe and currently will not work with Perl.