compile error message with Arduino Uno

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i have arduino uno loaded on both windows pc , mac (osx).
programs developed on pc , run fine.
when try verify  program uses ultrasonic module hc-sro4 on mac, following error message: 'newping' not name type. program runs fine on pc. appreciate help.
thanks,
ed

quote
the program runs fine on pc.

where library installed, not on mac isn't?


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