Graphviz tools are using a configuration file
(/usr/lib/graphviz/config5 at the moment) to get some
plugin options. This command is used in libgvc5 and
libgvc5-*-plugin packages' maintainer scripts to
update this configuration file when plugins are installed, updated, or
removed.
NOTE
This tool is intended to be used only in maintainer scripts and it
shouldn't be needed to run it manually.