'ImGuiConfigFlags_DockingEnable not found

I'm trying to implement ImGui in my opengl app, but, for some reasons, the flag:

ImGuiConfigFlags_DockingEnable

is not found. I even tried to go in the files and I didn't find the ImGuiConfigFlags_DockingEnable flag in ImGuiConfigFlags_ enum. Any idea?

PS: I included these files: Files



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