C:\Users\krist\Desktop\Brad\Arduino\libraries\ButtonDebounce-master\src/ButtonDebounce.h:11:14: error: 'function' in namespace 'std' does not name a template type

 typedef std::function<void(const int)> ButtonCallback;

              ^~~~~~~~

C:\Users\krist\Desktop\Brad\Arduino\libraries\ButtonDebounce-master\src/ButtonDebounce.h:20:5: error: 'ButtonCallback' does not name a type; did you mean 'ButtonDebounce'?

     ButtonCallback _callBack = NULL;

     ^~~~~~~~~~~~~~

     ButtonDebounce

C:\Users\krist\Desktop\Brad\Arduino\libraries\ButtonDebounce-master\src/ButtonDebounce.h:26:22: error: 'ButtonCallback' has not been declared

     void setCallback(ButtonCallback);