[ CCode ( cname = "aginitlib" ) ]
public void initlib (size_t graphinfo, size_t nodeinfo, size_t edgeinfo)
Low-level initialization function for the graphviz library, used only if you need to explicitly control the sizes of graph, node and edge objects.
Note:
It's not necessary to call initlib if you already called init because
init makes a call to initlib internally.