uint32_t error during compilation

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hi everybody, hope can this.
i keep getting error when checking code supplied programmer have upload test board.  it compiles on system cannot past error.  have tried various versions of arduino.
if has simple explanation or fix please let me know.



arduino: 1.8.1 (windows 7), board: "arduino/genuino 0 (native usb port)"

c:\users\dell\appdata\local\arduino15\packages\arduino\hardware\samd\1.6.11\cores\arduino\samd21\source\system_samd21.c:52:1: error: unknown type name 'uint32_t'

 uint32_t systemcoreclock = __system_clock;/*!< system clock frequency (core clock)*/

 ^

exit status 1
error compiling board arduino/genuino 0 (native usb port).

this report have more information with
"show verbose output during compilation"
option enabled in file -> preferences.



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