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 OOB is built without threads being enabled. OOB distributions containing "mt" in the distribution name are thread-safe and currently will not work with Perl.
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