The macro graphstruct.C in …root\tutorials\graphs
generates errors having to do with TGraphStruct being unknown.
Do I need to load any additional library first? I have built ROOT 5.26 on Windows using the graphviz package installed from its installer and the compilation seemed to go ok. In root\bin I have a library named libGviz3d.dll which I thought might be relevant, but it loads ok and TGraphStruct is still unknown.