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BEGIN {
  if ($version =~ /beta/){
      eval "use lib('/path/to/dev/modules')";
...
      eval "use lib('/path/to/prod/modules')";
  }
}

BEGIN {
  if ($version =~ /beta/){
      unshift @INC, '/path/to/dev/modules';
...
      unshift @INC, '/path/to/prod/modules';
  }
}