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  • So the function signatures within Arduino.h are defined by the libraries referenced, via the include statements shown in OP? Commented Nov 5, 2015 at 3:02
  • The headers referenced, yes. Commented Nov 5, 2015 at 3:13
  • Suppose there is an include in an include, so to speak. Would the header file pick up functions to the second level? Commented Nov 5, 2015 at 3:30
  • Does avr/someLibrary.h mean to that someLibrary.h is contained in a directory called avr? Commented Nov 5, 2015 at 17:00
  • @skywalker: That is correct. Commented Nov 5, 2015 at 17:17