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   -dot         Generate graph in dot format (used by GraphViz)
   -svg         Generate graph as Scalable Vector Graphics
   -html        Generate graph as HTML
   -gml         Generate graph as GraphML
   -vcg         Generate graph in VCG format
   -verbose     Display verbose messages as we run
   -h --help    This help

=head1 DESCRIPTION

B<prereq-grapher> parses perl source and looks for prerequisites,
such as modules that are C<use>'d or C<require>'d.
All of those modules are then parsed in turn,
looking for I<their> dependencies.

Once all files have been parsed, B<prereq-grapher> will write out
the dependency graph in one of the five formats supported.

The simplest way to run B<prereq-grapher> is just giving a module name:

  % prereq-grapher Module::Path