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Trouble getting usbMIDI to work on Teensy 3.6

I’m having some problems getting usbMIDI to work on my Teensy 3.6. The compiler keeps coming back with the following errors:

‘usbMIDI’ was not declared in this scope
identifier “usbMIDI” is undefined

My configuration is the following:
platform = teensy
board = teensy36
framework = arduino
buidl_flags = -D USB_MIDI

I’m using core version 4.3.4 if that’s relevant.

Some help would be really appreciated!

Looks like it’s just a typo - build_flags, not buidl_flags :wink:

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5 hours wasted…