Simply following README.md steps produced an error where "unordered_map" types were not found; Fixed by simply including it on the main header file.
@@ -9,6 +9,7 @@
#include <iostream>
#include <cstdint> // <cstdint> requires c++11 support
#include <functional>
+#include <unordered_map>
#include <Python.h>