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package Chess::PGN::EPD;

...
unless (-d $db_dir_qfn) {
    $db_dir_qfn = realpath('db');
}

Use of uninitialized value in -d at /home/sand/.cpan/build/Chess-PGN-E
+PD-0.28-WRroyj/blib/lib/Chess/PGN/EPD.pm line 22.
t/01_epdcode.t ...... ok
...
    usually optimized into "that " . $foo, and the warning will refer 
+to
    the concatenation (.) operator, even though there is no . in your
    program.