Um ... what does the documentation say? 

  sets debugging flags.  To watch how it executes your program, use
  -Dtls.  (This works only if debugging is compiled into your Perl.)

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I guess it is mandatory... if you want it to do something.

In reply to Re: Using -D option with perl, if perl not compiled with -D by Tanktalus
in thread Using -D option with perl, if perl not compiled with -D by jesuashok

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