In the library manager, key-in the value "'''NeoPixel'''" in the search box. Then click on the install button in the front of the '''Adafruit BMP280 Library by Adafruit'''.
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In the library manager, key-in the value "'''neopixel'''" in the search box. Then click on the install button in the front of the '''Adafruit DMA NeoPixel Library by Adafruit'''. This library is suited for the ATSAMD21 microcontroller as used on this Feather M0 plateform.