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Oh yeah, I should mention this here! Teensyduino 1.47 ships with a broken Makefile for the Teensy 4.0. It does not work at all. Here's how to fix it.

0. Edit ~/ardunio-1.8.9/hardware/teensy/avr/cores/teensy4/Makefile

1. Change -D__IMXRT1052__ to -D__IMXRT1062__ in DEFS.

2. Change -DF_CPU to 600000000

3. Remove -nostdlib and -nostartfiles from LDFLAGS

Yay, now it works! Use it as the basis for your next fun project.

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