From perldoc perlrun

     -Idirectory
          Directories specified by -I are prepended to the search
          path for modules (@INC), and also tells the C
          preprocessor where to search for include files.  The C
          preprocessor is invoked with -P; by default it searches
          /usr/include and /usr/lib/perl.
[download]

Mik
mikfire ( perlus bigotus maximus )