custom shapes

Custom Shapes with tcldot: No loadimage plugin for "png:tk"

Hi everybody!

I'm trying to create a graph with custom shapes. I'm using tcldot on a Ubuntu machine, so I'm using package: libgv-tcl Version: 2.26.3-10ubuntu1.
I've got a problem with adding a node with my custom shape using a statement like this with role.png in the same folder like the script:
set node [$g addnode $name label $name shape custom shapefile role.png fontname helvetica]
$g addnode $node
I'm getting an error like this:
Warning: No loadimage plugin for "png:tk"
and standard box nodes appear in my graph.

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