adding graphviz dep

diff --git a/Makefile.PL b/Makefile.PL
index be73cc4..77c378a 100644 (file)
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -15,6 +15,7 @@ WriteMakefile(
         'File::Basename'          => 0,
         'File::Spec'              => 0,
         'GD'                      => 0,
+        'GraphViz'                => 0,
         'IO::Dir'                 => 0,
         'Parse::RecDescent'       => 0,  # Is a particular version needed?
         'Pod::Usage'              => 0,