Graphviz as a library in C

I had installed the graphviz by graphviz-2.3.4.msi in Window7. It ran very well in gvedit.Now I want to use it in C program,but there is an error in the runtime.The error messege is "Graph.dll is missing...",and I can't find the "graph.dll" in graphviz-2.3.4,how can I deal with it?

Thanks in advance!

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